Amazon.com : Pentax K-1 Mark II Full Frame 36MP Weather Resistant DSLR with 3.2" TFT LCD, Black with Pentax HD PENTAX-D FA85mmF1.4ED SDM Prime Telephoto Lens and D-BG6 Digital Camera Battery Grips (
Pixco Pentax 67 lens to Pentax PK K mount adapter Pentax K-3, K-50, K-5 II, K-30, K-01, K-5, K-r, K-x, K-7, K-m, K20D, K200D, K1 _ - AliExpress Mobile
Using Pentax mount Sigma lenses on the Pentax K-1 Mark II camera - Pentax & Ricoh Rumors
Amazon.com : (3-Pack) Rear Lens Cap for Pentax K Mount, PK Lens Cap, Kmount Lens Rear Cover, PK Camera Body Cap for Pentax K K-70 K-1 K-3 II K-S2 K-S1 K-3 K-50
Konica Auto-Reflex (AR) SLR Lens to Pentax K (PK) Mount SLR Camera Body Pro Mount Adapter – Fotodiox, Inc. USA