When I purchased my C-172, it had a basic IFR panel made up of radios added over the years by different owners.  Some are as old as the plane (29 years), and the others added since then (some with no logbook entries).  Only the two TKM Nav/Coms had a users guide and installation manual.  I have since completed a listing of all the equipment in the plane, including part numbers and serial numbers.  My A&P has updated the equipment list for the plane, but I am still searching for user and installation manuals for several of the radios.  I would be appreciative of anyone who has or could point me to someone who has these for the following equipment:

  KA-134  Audio Panel
  KR-22   Marker Beacon
  KR-86   ADF
  KI-208  VOR Indicator
  KI-214  VOR/GS Indicator
  DME-890 Narco DME (have installation manual)

I have not been able to turn anything up on an internet search, and would be willing to pay a reasonable price for copies in good condition.