hifi engine

Sony MHC-1600


I found a Sony MHC-1600 at a recent boot sale, boxed for £18! Only issue is the belts on the tape deck are stretched. I believe the mechanism is used on quite a few Sony decks, but if someone could please point me in the right direction for replacement belts or even the size I'd need, it would be hugely appreciated! Or if anyone has a service manual?

Thanks in advance