Stupid me...

I can fab a loop that bolts to the seat bolts, I used 3/8"-16 grade 8 bolts that hold my 2000 Sebring seats to the floor (with 1/8" steel plates on the inside and the outside of the floor. I can bolt loop hardware to those. It looks like a 5-6" loop will fit nicely in the tunnel, and I can weld 2" wide x 1/4" thick steel bar to the loop. That'll do nicely. I can send pics whenever I make it; I'm waiting for my engine, so I can install it and the tranny first.