If the case was made to exact Rolex dimensions (like NDtrading, Yuki, etc), then they ought to fit. But most rep cases are nowhere that exact. In fact, most rep cases appear to be 'ballparked', at best. My guess is that things like retaining rings probably will not fit. But I have been (pleasantly) surprised on more than 1 occasion, so it is always worth a try to find out. Keep in mind that the gaskets used in rep watches are usually the lowest quality, so, even if they do fit, I would replace them.