What you have is an aftermarket set-up manufactured and sold by IPSCO.
https://ipsco.org/newsite/prod...ock-replacement-kit/
They can supply you with replacement struts or they might even tell you the OEM application, so you can buy a set on Amazon!
That being said, I believe the info you need to buy new struts is on the blue label in the pics you posted. 4903 is likely a generic, identifying part number. It will tell you the OEM applications, extended and compressed lengths, etc. The other number (16507) is likely the manufacturer's part number.