I went back and looked, and I found this little it of info (Hidden in a jumble of tiny fine print lol) "CJ & Wrangler kits place the battery side-by-side and may be used with lead acid or cylindrical-style sealed gel cell batteries."
So I think if it's for the CJ You can use both cylindrical and box lead acid batteries, but if it's for the TJ, it says this=
"TJ Wrangler kits stack the batteries and are for use with cylindrical-style sealed gel cell batteries ONLY due to the battery mounting."
So I am thinking it might just be the style you order. I still honestly don't know if it could fit your application. If it does work, You might be able to use a regular battery and a high amp battery, just as long as it has about the same dimensions as a regular battery.
I would hate for this to not work for you, but if it didn't, I am almost positive they would let you return it without problems!//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif