After getting acquainted with my 503cx, I wanted to be able to use it on my arca swiss head along with my other cameras and after searching here, it was either adapt the hasselblad plate to an arca swiss plate or swap out the tripod plate on my camera body. found clear sight still has this plate and ordered one. Very helpful guy and fast shipping. No problems there. But after checking, my original screws were too short and the paper work with the plate stated that if they were, to contact Hasselblad and order the longer screws needed with part numbers listed on the paper work. After contacting Hasselblad, I may have to give up medium format photography with this company as $15.80 for ONE 3.5mm screw is a little much for me. She double checked. That is the going price from Hasselblad. If anyone knows of a source with a better price, please indulge me.