You need 4 parts for the bezel assembly
crystal retaining ring
flat tension spring
bezel
bezel insert
Of course you'll also need a T-19 crystal.
https://www.ebay.com/itm/Stainless-Steel-Rotating-Bezel-Retainer-Spring-Insert-For-Rolex-5513-1680/113303777563?hash=item1a616e711b:g:zH8AAOSwAata25R0
This is an aftermarket bezel assembly, but the bezel insert isn't very good.
Also, your case may not work with the correct aftermarket parts- it appears to have a lip which means it had a non-standard bezel assembly (meaning a Chinese rep assembly).
You need to find a better case- check out Yuki watch, Ruby's watch, or Phong (Jewelryandwatch.com).
And remember, you are undertaking an expensive project! Good luck!