Hello cycle_collector,
what a treasure you have found! Thanks for being so thoughtful and offering these items to a community which is starving from parts shortage for their restoration projects!
I had a lot of instruments (~300) until a year or so until some family turmoil forced me to get rid of a good share of them. Nevertheless, there are quite some left that are waiting for service (I only sold the functional items). I moved to a new place recently where there is a lot of space to start all over.
For my current restoration projects (a 8660C-H04 and a 8640B-Opt.323, both lightning-struck) I am looking for the following hp parts: 1820-0571, 1820-1060 (if one more shows up), 1826-0092, 1826-0007, 1826-0114, 1854-0221, 1854-0492, 1855-0049,1990-0311, 1990-315, 1990-0330. More to come. I would be very glad if you could help, thanks in advance!