When my 3EE dies in my 63R3453 I'm planning to install Napa SureStart 65. It is 
smaller and 15 lbs lighter @ 27.8#, the 3EE is 43# It's 8 3/4H x 9 3/8L x5 1/16
 W. C.C.A @ 0 degrees F is 500. C. A. @ 32 degrees F is 625. Load test amps is 
250 and reserve capacity is 85. By my measurements it should fit in the same 
location as the 3EE. It is also less expensive than the 3EE. I hope this helps.
Gary Cramer, Grants Pass OR
SDC Forum Apr 2010

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I plan on using Harris Battery Company based in Ohio to purchase a 3EE Commercial battery. It's specs are the best I've found to date online:

3EE - 540 cca @0F; 675 CA @32F; 100 hr reserve capacity

http://www.harrisbattery.com/listbatteries.aspx?SubCatID=7&page=

John Graham, Mustang OK

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Try Antique Auto Battery of Hudson, Ohio. They make a Poly-Tar top WILLARD Battery with correct labeling and red caps. CCA's are 780! It's a AGM Battery in the old 3EE case.

http://www.antiqueautobattery.com/other.htm

scroll to bottom of list and click on view.

Excellent customer service and warranty too.

Chuck Sydoryk

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more at 
http://forum.studebakerdriversclub.com/topic.asp?TOPIC_ID=39749