A bona fide Ken-Bar JP7 body is probably as scarce as hen’s teeth. Finding one separated from its chassis is part of the challenge.
However, if any jeep body will do, you might consider a body from one of those ”jeep” go karts that are all the rage now. The first ones seen were generic (no brand) Chynuh stuff and the great bulk of them are a copy of flat fender ”WWII” jeeps (Willys MB or Ford GPW) in gloss olive green (super tactical!) but now there’s Massimo, Coolster and various others. The Massimo jeeps closely emulate the Toyota Land Cruiser FJ40 so that may not be your cup of tea but I did spot a later “CJ5” or you could call it a M38A1 military version. This body style is basically a Jeep Wrangler YJ but with round headlights and might be the closest you’ll get….
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txpowersports.com
I don’t know how big all these ”jeeps” are or whether they will match the wheelbase of your JP7 (if that’s what you have) or whether the wheel spacing will match the wheel wells and you’ll obviously have to do a lot of modifications to make it fit but they seem to be abundant and they list body parts on some sites:
massimomotor.com
There’s two sizes of Massimo ”jeeps”: Mini 125 and GKD 350.