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AFAIK there are no special requirements of the frame, you just add the p-clip thing to the NDS chainstay. It came off a completely unspecial alloy frame, so I think any steel frame would be fine. The chain stay has to take a rotational force, but I can't imagine it's bigger than your weight on it, and the actual braking force is through the dropout.
It's a BR-IM70-R(ear). This is the exploded diagram FWIW. SJS will sell you the missing grease port cover for a whole 99p!