OH interesting! I bought probably from the same seller a plexi. The writing on the envelope is the same (as on the link you send) and the reference number also... but it doesn't fit . The Edge should be 0.72 but it is 0.8! Also the Ref Number on the envelope 144-35-01 is the number of a Super Divette. The Ref should be 144-35-03.I've bought this crystal before for an Ops and worked perfectly: https://www.ebay.co.uk/itm/403055139546
It's not quite the same shape as an original one will be more curved but it looks great and fits nicely.