OK, putting in the sub mount strap (five point harness, I know may upgrade to six later).

How do you all mount the end of the strap to the floor. With eyebolt? Laying flat?

What?

And, the gas line is right under the place to mount the strap. Ask me how I know...

My 6-point substraps were mounted with the included eyebolts, going through two holes drilled in the floor, with a big piece of steel with two holes for the eyebolts drilled through it under the car for extra backup, and a washer, lockwasher and nut on each one. I can’t take a picture of it right now, but it’s pretty self-explanatory.

And yeah, you’ve definitely gotta watch out for the fuel and brake lines when you’re drilling in that general area.

Kevin, on cars where I have fabricated tubular seat mounts, I will weld tabs to the seat mounts.

Otherwise, I like to weld a 1/8" plate to the floor and then either drill and bolt-through the plate, or weld a tab to the plate.