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BMW 525d tourer September 2013 F11 - compatible gearbox for my 5 series - Dominic North

So, my BMW specialist has identified the crunching sound I get in second gear (6 speed manual). Its apparently the sycnhro and I cant find a replacement anywhere (neither can he). But I have found a whole rebuilt gearbox at a good price (compared to others). However, it is a GS6 17EG, I believe it is used in Z4, 3, 4 series. Will this also be compatible with my 5 series?

Any advise gratefully appreciate...asap before the recon gearbox goes to someone else.

Thanks!