I did a tray swap on my old '86 Sophie.
Not a biggie.
Places like Autozone sell primarily two sizes of battery tray. The bigger is too big for the 240s. Once you get the old one out you'll see how much room you have. The trays have big slots to accomodate the hold down screws to keep the new tray in place. I think I had to drill the tray for one screw, the others were OK in the tray slots. I got stainless screws to avoid future pain. Hex size is 12 mm. but one original one was so rusted that 11 mm. worked!
PB Blaster is my favorite for loosening rusted screws.
Various size batteries will fit the replacement trays. I like to get the biggest one I can fit in there. Just pay attention to which side the ground and the + cables belong on. Not necessarily by the book because your cables might have been replaced and swapped around by now. For '86 the + was by the fender but in later years they put in on the other side.
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Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.
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