I don't know what the slide in area is for. It seems to be held in place with glue strips, so I could peel it off and simply sell the new bellows, but before I do that, I'd like to know if is a specialty peice that someone may need like it is. It came with a box lot of goodies, some of which I'm keeping, but I don't need the Cambo piece. Thanks for the help. Usually I'm the guy identifying your oddball pieces. Been around this stuff a long long time, but this is new to me.