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Been there - done that.
Later years had the + terminal inboard and the ground by the fender. That probably accounts for the Group 46/47 mixup. It's kind of easy to short out the + when it's by the fender; I think that's why they moved it.
We've had 5 240s and several of them no longer had working hold downs. I bought the J-hook type hold-down at parts stores. They always worked. A stiff sheet metal bracket goes across the top of the battery connecting the two vertical J-hooks. It comes with the J-hooks, as I recall.
Depending on your battery tray you might have to drill a hole to accept the bottom end of the J-hook but you'll figure that out. J's come in stock lengths - I've always found that the available length to fully reach the top of the battery was too long (tall) to let the hood close. The J-hook on the forward side of the battery will need to be cut down a bit - hacksaw or whatever method you prefer.
It's possible to replace the battery tray with a new plastic one if yours is rusted away. PB Blaster will help free up rusty screws that may be at the bottom of your old tray. They sell 2 or 3 sizes of plastic replacement trays, just get the largest that will fit in your engine bay. Buy new screws to replace the old rusty ones. Standard metric size, you can match them in a hardware store. The replacement trays are usually marked with the battery sizes they will hold but you have to pay attention to height clearance after you install it.
I left battery size for last because - - -
Lately I've mostly ignored the "correct" size. On an old beast like an '85, get the biggest battery you can fit into your tray and available space. Just make measurements with a tape. A bigger battery will have more lead + acid in it and will do a better job, all other things being equal. In my humble opinion of course.
Good luck with it!
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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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Been there done that, a few times [200][1985]