Don't use a rivet nut that big... I'm using 1/4 20 rivet nuts with grade 8 bolts. Works great. Way easier to install.. look at how big you have to drill that hole for the rivet nut.. for mine it's already 25/64ths...
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Could I just get a normal locking nut and just jb weld it on? Or even normal weld? I would like to use original bolts if I can.
I like cars and stuff.