I have multiple models of Optiplexes, which all use identical (or nearly identical) 3.5" blue caddys. We're replacing the 3.5" drives with 2.5" SSDs.
I've tried an assortment of 9 different 2.5/3.5 mounting plates so far, but they're mostly all made to center the 2.5" drive, which makes the SATA/power connectors align differently, getting blocked by a tab on the end of the caddy. They're also usually recessed into the caddy further than a full size drive, so the cable connectors don't reach the drive. And then the screw holes in the mounting plate often don't line up with the little protruding studs in the caddy.
Surely, someone has found a specific adapter they use for this situation? I'm sure they exist, and that I just haven't found the right one yet.
I know Dell has a different blue caddy for 2.5" drives, that they use if you order...