So do I, along with the 8" variety. ;-D
I also have a collection of fuse-link, UV-PROM, and EEPROM memory devices.
I wish I had a set of AM2900 bit-slice elements.
When we were mothballing an older IBM system, we opened one of the cabinets for the disk drives and I took out a few parts, like the hard drive itself, and kept them.
I am 100% sure one of my coworkers has some sets of AM2900 bit-slice elements.
He likely has an IBM 5100 too