Tuff Stuff
There’s $10 difference from a Tuff Stuff Pump and a Bergman; BAC
Tuff Stuff is just selling a pump. I don’t see why this pump is less prone to leak than others.
BAC is the one you are following the advice from, has experience doing this conversion in a mopar, can actually give you customer support, and probably someone you are buying more conversion hardware from...
Buy the Bergman BAC pump.
These conversions can have issues, give yourself a fighting chance and put some support from BAC in your corner.