I have a LPL 7700 also. Produces nice light! My carriers are moulded plastic (one 35mm and one 645). There's a 6x7 (and I presume 6x6 version) too but they are expensive (about $100 AUD). If your carrier has metal inserts for different formats, if you can't locate the LPL ones, then a machine shop should be able to knock up a couple cheap. Alternatively, make some out of matt board... Thats what I use in my Durst M601 (glass inserts in carrier drove me nuts!)