Brian from Backblaze here.  Just to be absolutely clear, you cannot &quot;buy&quot; one of these from Backblaze.  We don&#x27;t sell them.  You are free to take these instructions and assemble one yourself though!  And so yes, you could simply drop the 6.0 controllers into an older chassis and it will work fine.<p>Also, the 6.0 housing will fit in most racks.  If somebody can either measure their racks or include a link where the 33&quot; chassis will no longer fit, we really want to hear about it!