Just as a follow up to my own post, it seems that the MF kit was offered with some M670 sales, but most were sold separately. The kit consists of a Vegabox 667 diffusion box and the masks for 645, 66 and 67 negs. Durst sure made things complicated with their obscure nomenclature!

Mike

PS I've been fortunate in that my seller has the Vegabox 667