Guys, like you, I decided there was no way I was going to put my filler neck thru the floor of my white oak bed, AND I definitely wanted to keep my spare where it belonged. Here was my answer, but admittedly it was a buttload of work. GM discontinued the Pontiac Fiero in 1988. The tanks are steel and about 10 gallons each. I remember buying the pair for $100. I did not have to relocate or modify any crossmember, however, it did require that I had to relocate the e-brake crossbar forward in the frame. I did all this probably 20 years ago, so the details are a bit foggy but the pictures should speak for themselves. Good luck, Dave