Hoping to get help with wheel sizing

Hello everyone. I hate to sign up for a forum just so I can make one posting asking a question but I'm at my wits end trying to find this information elsewhere on the internet so here I am.

I have a pair of inline skates which I've owned for 10+ years now that are in desperate need of new wheels. Problem is the size markings have worn off and I can't seem to find the proper size anywhere.

They are Bauer Supreme 3000, the frame says Tuuk ShifterII and they are size 13 if that matters.

I recall that they use different sized wheels for the front two and back two wheels and I want to say the backs were 80s but that's all I have to go on.

Any help would be greatly appreciated.
Thank you very much.