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You might look at that tag again. I believe you missed one.
I bet if you look right where the bolt goes through the tag you'll see part of a "3". Thay would make the second line read:
35510 2 6F10
A 3.55 ratio 10.25" rear end. If it's a "full floater" rear end, then you'll have hubs protruding about 3 inches from the brake drum. If it's a "semi floater" then the axle hubs end about flush with the drum just like all F150s and almost all rear wheel drive cars do.
That should be enough info for you to buy parts or whatever you are trying to do.