Pixco EMF AF Confirm PRO Lens Mount Adapter - Contax 645 Lens to Canon EF Mount EOS 6D Mark II, 7D Mark II, 5D Mark IV,1D series - AliExpress
Amazon.com : Fringer New Version Pro II Smart Adapter CONTAX 645 Lens to GFX50,50s, GFX100,100s Camera Auto Focus : Electronics
FotodioX Pro CTX645-GFX Adapter with Support Foot for Contax 645 to Fujifilm G-Mount at KEH Camera
Amazon.com : Fotodiox Pro Lens Mount Adapters, Contax 645 (C645) Mount Lenses to Fujifilm X-Series Mirrorless Camera Adapter - fits X-Mount Camera Bodies Such as X-Pro1, X-E1, X-M1, X-A1, X-E2, X-T1 :
Phase One Insert for Flex Adapter for Contax 645 – Capture Integration