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 and front panel 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