15x7" Spare Steelies / Stock Wheel and Tire Size

I just bought my truck and it came with stock alloy wheels and some really old BGFs tires on it. After researching tire and wheels sizes I decided I wanted to stick with 31" BFG T/A KO2s (31 X10.50R15) So I put those on the stock wheels. I realize that limits me as far as changing to different wheels.

To my point. I am wanting to put four 15x7" black steelies (pictured below) that came as a spare on these years. I really like the look, strength, and simplicity.

Has anyone done this with the 15" size spare wheels yet?
Anything I should look out for when planning to do this?

I was looking at a couple on Ebay and ordering through some online scrap yards..

 

Did you do it? I've been tossing around the same idea for a few years but always get discouraged/sidetracked because the 15s seem pretty hard to find.

 

I'm running those same tires on 15X8 -19mm. No issues with rubbing with a small 1.5 lift in the front. There was very minor rubbing on stock height on the plastic piece...very minor as in if I had another 3-5mm, it would not rub. Running the same setup for the spare wheel as well. I'm thinking of going 33X10.5X15 in the future.