{Collins} WTB: Collins 353A Filter Assy for HRO-60

Am looking to buy a Collins Mechanical Filter Assembly that was manufactured for the National HRO-60 
receiver.  The Collins model number is 353A-XX where the XX represents the nominal filter width.  Also looking to 
buy an original Collins 353A manual (or literature) as well.
Thanks & 73,
-Paul  W8ZO
Sponsored by the Collins Collectors Association http://www.collinsradio.org
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