For me it was a preference thing. I was looking about and noticed how far below the rear valence the spare tire well and the fuel tank was on these A bodies.
Normally not a concern but with a 2 inch drop and the new very steep railroad crossing and seeing other A bodies scraping the bottoms a bit, I didn’t want my fuel cell hanging that low. So I raised the bottom of the mounts to be flush with the bottom of the rear valence. Which put my fuel cell 1.5 inches raised a over the trunk floor. Which I was simply going to raise the trunk floor to make it flush. HOWEVER, I didn’t account for the fittings and such, the -8 AN 90 degree elbows for the return and the vent are 3.5 inches tall, threaded onto an inch taller fitting.
