[jessej]

I'm not aware of any such product existing, unless it's the "RB Prism II", quite an old beastie indeed. You got a picture of it?

RZ/RB Accessory Compatibility Listing.

That list is a lot of help, thanks! My prism came and it wasn't the original RZ AE prism like I bought, but a RZII prism. Works just fine, B&H's mistake, it costs more than what I paid too!

And here's that prism, guess it is the RB version, that'd make sense.