Don't know on the steering wheel mod.
But I keep seeing folks mentioning needing large washers. I got a set of these when I put my seat belts in a while back. If I do a new bench, will likely pony up for these there too.
https://www.holley.com/products/inte.../parts/BELTANC
Yes a bit pricey and may be a bit of overkill depending on your use case.