2.5x3.5 cut film holders for Mamiya RZ67?

I read somewhere (I think it was in the RZ67's instruction manual) that Mamiya made a double sided 2.5in. X 3.5in. cut film holder for the RZ67. A quick search on eBay found nothing at all...

Has anyone used this holder before and any idea where I can possibly find one?

Thanks.
-ZiYang
Dead Link Removed

I have at least 6 of these in great shape, and the adapter to allow them to work on the RZ67. Feel free to email or PM. I am sure we can work something out.


-Ed

Won't the old style slotted Graphic holders work? Or is the spacing wrong?