Experts? Tire backspacing and tire wheel combo?

[CJ5 Convert]

Once again I'm in need of yalls help. I have some 15x10 wheels that I'm going to use for a while b.ecause I just need the old girl on the road. I have a few issues though.

1. I can't figure out the backspacing in these old wheels I have, heck I can't even figure out the brand. I'll post wheel pics at the bottom.
2. I can't figure out if what I have will have any negative impact on what I'm doing. (tuff country easy ride with 4"front/4"rear and zero certs).
3. I want the tires to look right on the rim. I'm going to put 33"x? I'm thinking 12.50s. also how will the width of these tires affect my paint ( i'm mean like 2 years from now when I get it painted), are they constantly going to be tossing rocks. -Thanks Jason

http://picasaweb.google.com/jason.wi...67366607404002
http://picasaweb.google.com/jason.wi...76605082057714