I would check the website of the battery manufacturer for measurements, then measure the compartment to see what will fit. The bigger, the better generally. Couple 6 volt golf cart batteries are usually a good choice or a pair of group 27s
Krusty
92 F-250 4x4 460 5spd 4.10LS Prodigy
97 Rustler RT190
EU2000i
Garmin