On my dearly departed Eagle, I took the battery tray, make cuts in the corners & flattened out one of the long sides of the tray. It was able to hold a bigger battery (800 - 1000 CCA) It did fit between the fender & the AC line. You could probably rig up a strap to hold it against the fender & away from the AC line. I ran it for several years like that with no problems. I have used several brands of batteries over the years, Delco, Interstate, & AmeriStart. the latter is less expensive than Interstate & has more oomph. It also lasts 6 years.