Every once in a while there is a gifted person out there that takes it upon himself to help us Technicians and DIY hobbyist to fix their decks by making available parts that are very hard to find. This Fellow I talk about here is Marian. He has a web site that has many great products and if you are working on a tape deck, you are best advised to at least look around his site to see if he has a part you are looking for. I have purchased from him for the Sony WM-D6C and it is great to get parts that are just what we need.
I highly recommend you go check out this resource of parts- https://fixyouraudio.com/
BELTS- Do you know the size? This is where Technician get their belts from.