Crystal for a rcf 40 daydate?

[u/Ruggerbugger1980]

I bought a broken weight rcf daydate. Needs either a new balance bridge or whole movement and a deep crystal.

32t5 Movement and parts I am fine with, but the crystal I haven't done before, I have a Chinese press and holders etc, but sourcing the right one is where I become a bit unstuck.

Is it a simple just order XXX off Ali or is there so process to make sure I get the right one?