Long after demise of my 1000F, I bought a 2000FCM. With Killfit adapters and adapters made by using Hasselblad micro lens block I was able to once again use my Killfit, Leica, Zeiss, and Nikon lenses. For years my standard lens was Killfit 90mm MacroKillar, and my only Hassy lens was 60mm. Only able to afford Hasselblad lenses when prices dropped due to arrival of digital capture. Now awaiting death of 2000 FCM (think Wotan waiting for death of oak tree and Valhalla). Believe it or not, longer Leitz, Zeiss, and Nikon lenses cover 66 format.
For eBay, add Killfit to your watch list because they show up occasionally.