Cartridge Kit, Cover End, Ring Size 03

For a Vickers V10 with a 03 ring size on the cover end, yes, this is the correct cartridge kit. The catalog number is C1CC35 and it's sold under the Eaton Vickers line through Danfoss Power Solutions. Just make sure you're ordering for the cover end specifically, not the port end, since those are separate kits.

This cover end cartridge kit is designed specifically for the Eaton Vickers V10 series pumps. The "03 Ring" designation should match your existing cartridge if you're replacing like-for-like.