HELP!Crystal gasket replacement info needed?

[horologist]

Does anyone know where to get generic crystal gaskets for the Silix range Submariner rolex? My understanding is that replicas manufactured for different suppliers varied slightly in their case sizes (not exactly sure if this is fact?). The watch supply house that i deal with stock by model number ( obviously for genuine makes of watches) and also sell the generic versions, which doesn't help as I am dealing with a replica.

If anyone has ever replaced more than one crystal gasket, what variations are there in sizes for different submariners from different suppliers?

any feedback would be greatly appreciated with thanks!!!!