That bolt in pump hanger looks like an easy solution for a lot of folks. Here's a stainless option that uses a late model GM pump and well for DIY tanks.
https://rickstanks.com/product/weld-in/
This kit includes the plate and a few other goodies and looks like it's under $150.
https://rickstanks.com/product/d-i-y...v=47e5dceea252
Here's info about Earl's pump mounting rings. Stainless, mild steel, or aluminum options are available.
https://bangshift.com/bangshift1320/...-installation/