Sternkruz Crystal for Seamaster 165.002 (pz5028)

I believe the correct crystal for the Seamaster 165.002 in steel is a ref PZ5028. However, I can’t get hold of one of these and I’m sending the watch to an independent watchmaker for service.

Does anyone know the sternkruz alternative for this crystal (and also whether there are any fitment issues with using a generic crystal).

If it’s an absolute necessity I can send to STS as they are great but in this case I’d prefer to use an independent to retain the original crown and keep the costs down.