Omega Speedmaster 3513.50 Sapphire crystal change and bezel swap

Hello. This is my first post so hello to all.

I have issue with my Omega 3513.50.00 which I bought couple days ago as used watch.
There is a small damage on sapphire crystal and I would like to replace sapphire crystal with new. Can anyone tell what is OEM part number for sapphire crystal and gasket if needed? I know that I can buy it from Dealer but maybe It is possible to buy OEM part cheaper

Second case is that bezel of my watch is also damaged and I would like to swap it from steel to black one.
I get some knowledge that this operation is possible with bezels from models 3520.50, 3520.53 and 3520.33.
Can anybody confirm that case of my watch and these models are the same and Bezel will fit 100%?

Thank you so much for all the answers

Thank you so much. Should crystal gasket come with crystal in one packaging? I found this crystal saphire on eBay. Seems to be genuine as it is packed in Omega box but I am little bit concern if it should be together or no. On ebay it is only crystal w/o gasket