WTB - HP 8557, 8558 or 8559 Parts Unit

[WB8ICT]

I am looking for a parts unit for any of the HP 8557 and higher series of
Spectrum
Analyzers. I need especially the knobs, front panel and switches complete
and don't care
if the unit works or not. The more complete, the more I'll pay. If you only
have the knobs,
I'll take them. Please advise condition and price on reply.

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Thanks,

WB8ICT

WB8ICT@NOSPAM.arrl.net