I agree you should take one hub off and get dimensions, only because it may have been swapped out sometime in the past.
Once you get to that point, I would go here
to look up the parts. They have the best index of hub styles, bearing numbers, dimensions, descriptions I have found.
Even if you don't order the parts from them, the numbers are nearly universal.
Although they have the best prices, some people won't buy from them because they might get "Non-Timken" bearings from Yugoslavia. That's a choice you need to make. I haven't had any problems.