Choose the ones marked for, “LPL/Saunders 4x5" and Omega D5 Enlargers”. They don’t specifically say 4550, but they fit. I have an LPL 4550VCCE XLG with those three sizes.
Thanks, John. I saw that, but was hoping to find used (cheaper). If I can't find a used one in the next few weeks, I can get a new one, from Canada, for about $40 less.