Hi All, Rebuilding the darkroom after several years now of trying to perfect b/w digital. Ah well. Anyway, I'm going to do 4x5 b/w with my D5500 this time around. I was previously set up for medium format and had the appropriate carrier and "masks" for 645, 66 and 67. I also have the "mask" for 4x5, but not an appropriate "carrier". I put these words in quotes because I'm not sure I have the right lingo; I'm looking for the Omega part that holds the thing that holds the negative- not the part that actually touches the neg, but rather the part that is in contact with the enlarger. I hope that wasn't too confusing.. Wondering if someone has a part # for this, or maybe just the correct name- I'd hate to buy the wrong part. Thanks!