Get you a very small foam roller. I found one at Lowes that was maybe two inches wide, one inch diameter. It did the trick and was very consistent on the coverage.
I think you want the low profile wrench organizers, not the space savers. FWIW, I have space savers in a 2.5" and they work perfectly from 1/4" to 1-1/2". I think they are awesome and work as designed.
Then customer service is correct. The professional tools are made in USA (just not made anymore). The full polish tools that are meant to replace the pros are made in china.
I've never done this, but I would think you could make a large backing plate to mount on the underside of the sheet metal. This should be sturdy and good for anything other than heavy duty work.