They might be hard to find because I have 4 - in various condition. PM me if you don't mind it coming from Canada.
Maybe I spoke too soon. The ones I have came with C760 enlargers. According to KHB's website they are different part numbers but the same Dichro Lamphouse fits both.
Anybody know for sure if the carriers are really the same?
You might have to buy a 6x6 carrier and elongate it, or you could make a carrier out of mat board. 6x7 carriers are scarce, and danged expensive to buy new.