The Adapt-All-620 comes/came in a 2x3 size. It slips under the ground glass. They come up on Ebay from time to time. But you have to make sure it's the 2x3 and not the 4x5 size. Downside, they were designed for 620 film, not 120. You have to use a 620 spool on the take up side but a 120 will work on the feed side. The Busch Pressman's, both 2x3 and 4x5 will NOT accept Graphloc backs, you have to find one that slides under the GG.