deore LH crank on 105 chainset I have a 105 triple chainset (hollowtechII) and the left hand side has developed a crack. Now I can't find any replacement 105 LH cranks but there are some Deore ones on the ebays that aren't too expensive.

So will they fit? I know since it's Shimano nothing is compatible with anything else, you're supposed to just go out and buy a whole new bicycle, but I'm hoping…
All Shimano Hollowtech II road crank arms are compatible, however, the Deore is a mountain range. I don't think these are compatible, but I can't find anything.

You might want to look for a HT2 road crank arm. The Shimano road ranges are DuraAce, Ultegra, 501, Tiagra, Sora and 2100. Not sure if these all offer HT2 cranks.

Also, you'll need a special tool (TL-FC16) to install the preload cap.