Has anyone successfully replaced a crystal in a Polerouter with Cal 138SS movement? I think the case references will be 20217 or 20214.

If you have, and the new crystal has a profile similar to the original, could you please provide details of where you sourced it?

I bought one of the crystals pictured below, only to find it didn't fit, despite the fact that the packaging specifically refers to a 2017 Polerouter. The new crystal measures extremely close to the 30.4mm noted on the packaging but the existing crystal seemed to be slightly smaller at around 30.0mm.

Thanks in advance for your help.