They are a cross between Group 2E and a 97r (lol, the closest size is 2E but they are wider and taller)
On the batteries is L2404 and on the front GFM150 my guess is they are a chinese standard and something worth noting the 150ahr seems to be the UNDER LOAD capacity with peukert figured not the nominal capacity which is why its hard to get a battery that performs similarly to these gigantic batteries.
If he wanted 4 6 volt batteries in the rear pack he would need to remove the battery charger and reroute it up front, one of the dealers said to remove the front grill and slide stuff around to fit in the 4 6 volt batteries but some new battery hold downs would need to be made as they just float there over the motor on a few carefully placed strips of metal.
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