Standard battery is a Group 41 battery.
A Group 91 is the same physical dimensions with slightly better specs.

On Apr 11, 2007, at 2:28 PM, Jake Bryant wrote:

> Hi all,
>
> I've done a couple of searches and come up empty.  Can anyone tell
> me the
> specs for the OEM battery on an 87 Westy?  I need to replace a non-
> standard
> "oversized" battery which had been installed in my vehicle by its
> previous
> owner.  If possible, I would like to try to find the right size,
> CCA, etc.
> Thanks.