The 37mm for the RB or RZ (yes the RB can be used on the RZ, however it will just have the features of the RB) is a Great lens for this application. It's not 4x5 but you are talking about 6x7,6x9,or 6x12, so not a big issue with this quality lens. So I second Miles' suggestion. You will not be disapionted, I consider this one of my most profitable lenses.
Many moons ago, I modified a 37mm Mamiya fish-eye to fit a Linhof Kardan 45S view camera. I bought a mounting flange from Mamiya (as a repair part), put it on the lens board, made a retainer for the shutter cocking lever from a paper clip, and made some fabulous, full round images. We made several prints at 40" final diameter and they held up beautifully. I had a machine shop mill off the integral lens shade (protector) tabs, otherwise they would show in a full circle image. The lens had to be cocked from the back side of the lens board ut on a camera like the Kardan, that was easy. Good luck!
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