not sure why you can`t find the 6V Optima here:
https://www.optimabatteries.com/en-...l=Truck&engine=L6-3.5L&find=find
any local parts store should be able to get you a 6V battery^, lotsa different brands out there

Bill



Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics