RCA Microphone Parts

[K7KWD]

I'm looking for two minor parts:

1. a thumbscrew for an RCA 88-A (see photo). I would prefer the earlier shiny type but the brushed finish will work too.

2. A knurled nut for an RCA 77-D for attaching the mic to the yoke (second photo).

If anyone has either of these, please give me a shout. Thanks.

Update: I located the 77-D part but I'm still looking for the thumbscrew for the 88-A.