Pentax Mount Adapter K (M42-Pentax K) - Lens Adapter
Pentax Mount Adapter K 30120 B&H Photo Video
Genuine Pentax M42 Screw Mount to K Mount Lens Adapter -Nice- - Victory Camera
Asahi Pentax Genuine Mount Adapter K 30120 M42 lens to K mount Camera Body #B115 | eBay
M42 Pentax PK Mount Adapter Ring with tool Silver For M42 (42x1mm) mount lens to Pentax K Mount Camera K3 K5 K7 K10D K100D etc.|Lens Adapter| - AliExpress