I use an Interstate MT-26 in my '54 3104 converted to 12v. The dimensions are smaller than an original 6v batt for the truck. Only 525 CCA. Not a lot of freezing / cold start weather in Central FL, so that works OK.
Interstate 12v batt specs and dimensionsEventhough the terminals are on top of the battery, the cable connectors touch the reproduction
battery top retainer. So I used an angle grinder to remove the area of the retainer that touched the connectors.
chadkiser - That's exactly what I did to hold the battery in my '54 before I adapted the retainer. Painted mine black to satisfy my obsessive personality!
- Lonnie