Benn buyin' mine from Sam's Club for the last eight years or so...
Just make sure you get a Group 1 if your battery is still under the floor...Group 2 battery won't fit in the battery holder...
Sufficient battery cables are critical: no smaller than #2...#0 or #2/0 is even better !
Never had cold-start problems with my six-volt Bolts...rather the opposite: darn 235s won't crank when they're hot !
Good luck !