Does anyone know of a list showing caliper piston seal sizes (OD, ID, Section measurements) from different brake manufacturers?

I’m trying to find seals for my Saint M810 4-pot calipers and as Shimano don’t supply such parts there must be equivalents out there used by other more serviceability oriented manufacturers such as Hope / Hayes.

The M810’s have two piston sizes. The larger one has an Outside Diameter (OD) of 19.5mm, Inside Diameter (ID) of 15.5mm and a 2mm section. The smaller ones have OD of 17.5mm, ID of 13.5mm and section of 2mm. Any help would be greatly appreciated 🙂