FWIW, KHB doesn't list a 6x8 carrier in its list of Negative carriers for the D2: http://www.khbphotografix.com/omega/...2.htm#Carriers

Unless of course that corresponds to something like the "Linhof Ideal" carrier.

A 6x9 carrier would work for negatives in strips, while a rapid shift 6x9 glass carrier would work with single negatives, as would a 6x7 that has been modified.