Crystal Replacement Question

[RedJim]

Please could anyone help with this crystal replacement question. I am looking to order a new acrylic crystal for the attached Mondiane I got this week. It just pops out of the bezel, not glued in. I've measured it at 32.48mm (seems like an odd size) both inside the ring and the crystal itself if that makes sense. Difficult to measure the height but I thought it might be a high dome without step? Some advice from a Facebook forum suggested that a Domed with step might be better due to the height of the cushion dial. Just want to make sure I order the right thing. Any advice appreciated. Thanks.

[oldhippy]

As it's a sweep seconds a high dome is required it doesn't need to be stepped.  

[RedJim]

Thank you.