Giant S-XC2 Bearing replacement

I’ve bought a set of these wheels and the front bearings are rough. I believe they run on cartridgecartridge bearings but can’t find replacements tagged for this wheelset anywhere. Anyone have any pointers? Is it just a case of popping the old ones out and measuring them?

The old ones will say on the seal what they are – most likely a 4 or 5 digit number starting with a 6 – 61902, or 6001 or something. Order the ‘2RS’ variants of these.