[Guide] "Lego" 8-bay, dual Xeon, ultra-quiet build (2019 updated)

115X and 1200 all share the same mounting. These are consumer sockets.

Server/enterprise sockets are different.
1366 and 1356 share the same mounting exactly.
2011, 2011-3, and 2066 have the same mounting holes as 1366/1356 but use different screws.