Answers.Body: <p>Dimensions are, respectively:</p>
  
  <ul>
  <li>3651 - <a href="https://www.brickowl.com/catalog/lego-technic-connector-pin-bush-with-2-studs-3651" rel="noreferrer">0.8cm x 1.6cm x 1.1cm</a></li>
  <li>32013 - <a href="https://www.brickowl.com/catalog/lego-angle-connector-1-32013" rel="noreferrer">0.8cm x 1.6cm x 0.8cm</a></li>
  </ul>
  
  <p>Distance between one axle and end of another also did not change. So for most builds it should work.</p>
  
  <p>Incompatibilities include:</p>
  
  <ul>
  <li><p>Obvious lack of studs</p></li>
  <li><p>Use as in <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?S=8034-1#T=S&amp;O=%7B%22iconly%22:0%7D" rel="noreferrer">Lego Technic Universal Set 8034</a> as a locking mechanism for lift system, as seen on the box:</p>
  
  <p><a href="https://i.sstatic.net/rii3k.png" rel="noreferrer"><img src="https://i.sstatic.net/rii3k.png" alt="Part of 8034 box"></a></p></li>
  <li><p><em>This answer was posted as Community Wiki, please add incompatibilities if you know them</em></p></li>
  </ul>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-03-08T19:58:56.203Z
Answers.Text: Yes! The old part can be used as a "lock" or "stop" to prevent gears turning, and it works because of the flared edge. The new one (32013) does not have this, so you might have to improvise a bit.
Answers.UserDisplayName: Benxamin
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-02-22T11:23:13.430Z
Answers.LastActivityDate: 2018-02-22T11:23:13.430Z
Answers.UserDisplayName: Mołot
Body: <p>In my old sets there are many 3651 parts that are broken.</p>
  
  <p><img src="https://i.sstatic.net/rdItx.png" alt="3651"></p>
  
  <p>As far as I remember, these sets do not use studs on the piece. Per <a href="https://bricks.stackexchange.com/a/2901/9417">this answer</a>, new piece with the same function is 32013:</p>
  
  <p><img src="https://i.sstatic.net/ZY4l8.jpg" alt="32013"></p>
  
  <p>Can I just buy some of 32013 and use it everywhere instructions tell me to use 3651? Is it supposed to just fit? I could try to build 3651 but I'm afraid I'll   break it  again.</p>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-02-22T10:36:20.400Z
Comments.Text: Can't think of anything why the 32013 would not fit as replacement, except when the studs would be used and although I also can't immediately name a set where they were used, I have a feeling that there are some.
  The 32013 looks to me sturdier, the technic bush shaped part of 3651 is prone to cracking (like the technic bushes themselves)
  I agree with the answer you refer to that the redesign happened because of the introduction of the new angular connectors.
Comments.UserDisplayName: Michael Verschaeve
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-02-22T10:41:45.163Z
Comments.Text: @MichaelVerschaeve I was afraid that lengths might not be the same. I can't find technical drawings of them. "Prone to cracking" - yes, exactly :(
Comments.UserDisplayName: Mołot
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-02-22T10:46:27.113Z
Comments.Text: Besides the studs there is another difference that may affect the interchangeability: the 24 tooth gear next to its leg would intersect with the newer one.
Comments.UserDisplayName: BalazsToth
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2018-02-22T11:23:40.193Z
Comments.Text: @BalazsToth I posted CW answer, feel free and invited to add to it.
Comments.UserDisplayName: Mołot
Tags: <technic><compatibility>
Title: Is 32013 a drop-in replacement for 3651?
UserDisplayName: Mołot
ThreadText: # Is 32013 a drop-in replacement for 3651?
  
  (Asked by: username_0 on 2018-02-22)
  
  In my old sets there are many 3651 parts that are broken.
  
  ![3651](https://i.sstatic.net/rdItx.png)
  
  As far as I remember, these sets do not use studs on the piece. Per [this answer](https://bricks.stackexchange.com/a/2901/9417), new piece with the same function is 32013:
  
  ![32013](https://i.sstatic.net/ZY4l8.jpg)
  
  Can I just buy some of 32013 and use it everywhere instructions tell me to use 3651? Is it supposed to just fit? I could try to build 3651 but I'm afraid I'll break it again.
  
  **Tags:** technic, compatibility
  
  > **Comments:**
  > **username_1**: Can't think of anything why the 32013 would not fit as replacement, except when the studs would be used and although I also can't immediately name a set where they were used, I have a feeling that there are some. The 32013 looks to me sturdier, the technic bush shaped part of 3651 is prone to cracking (like the technic bushes themselves) I agree with the answer you refer to that the redesign happened because of the introduction of the new angular connectors.  
  > **username_0**: @username_1 I was afraid that lengths might not be the same. I can't find technical drawings of them. "Prone to cracking" - yes, exactly :(  
  > **username_2**: Besides the studs there is another difference that may affect the interchangeability: the 24 tooth gear next to its leg would intersect with the newer one.  
  > **username_0**: @username_2 I posted CW answer, feel free and invited to add to it.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_0 on 2018-02-22. Score: 8 | Accepted answer
  
  Dimensions are, respectively:
  
  * 3651 - [0.8cm x 1.6cm x 1.1cm](https://www.brickowl.com/catalog/lego-technic-connector-pin-bush-with-2-studs-3651)
  * 32013 - [0.8cm x 1.6cm x 0.8cm](https://www.brickowl.com/catalog/lego-angle-connector-1-32013)
  
  Distance between one axle and end of another also did not change. So for most builds it should work.
  
  Incompatibilities include:
  
  * Obvious lack of studs
  * Use as in [Lego Technic Universal Set 8034](https://www.bricklink.com/v2/catalog/catalogitem.page?S=8034-1#T=S&O=%7B%22iconly%22:0%7D) as a locking mechanism for lift system, as seen on the box:
  
    [![Part of 8034 box](https://i.sstatic.net/rii3k.png)](https://i.sstatic.net/rii3k.png)
  * *This answer was posted as Community Wiki, please add incompatibilities if you know them*
  
  > **Comments:**
  > **username_3**: Yes! The old part can be used as a "lock" or "stop" to prevent gears turning, and it works because of the flared edge. The new one (32013) does not have this, so you might have to improvise a bit.  
  
  ---
  
  