For Trade Vivitar Matched Multiplier for 75-205mm f3.8 zoom, K mount

I would like to swap a Pentax K mount matched mulitiplier (for 75-205mm f3.8 Vivitar [Kiron] zoom) for the same matched multiplier in Nikon mount.

Or, I would sell my 75-205 f3.8 Vivitar zoom (clean, Kiron made) WITH the matched multiplier (both in Pentax K mount) for $75 shipped within the USA. Clean lens. Kiron quality.

Photos on request. Please send me a PM if interested.