the same ones I use for standard 35mm.

I don't have an xpan, just borrow a friends when I use it.

I use the 7 rows x6 negs/strip from Freestyle.

since I shoot MF(6X7) as well, I make contact sheets on 10x12(cut from rolls for color) or 11x14 paper(cut down to 10x12 after processing), cause the page size is perfect for this 10x12, just fits.