Maybe I should have been more clear. There were no retaining rings included and I couldn't find evidence online anywhere of retaining rings being used or even sold. All the info I've seen describes press fitting.
There most certainly is something wrong with what I got. If you're correct and...
Hey everyone!
I've searched all over and I'm at my wits end. I ordered some of these intending to use them with various salvaged diodes from optical drives.
I'd read up on diode install and I was all set to press fit, but when the housings arrived they looked like the first attached picture...