This has an M-38 hood and a spare tank under the passenger, among other mods.
“Very Nice Jeep. Great tires and wheels. Very nice cloth top. It has 2 new under seat fuel tanks that were professionally installed.
It has a V-6 engine. 3 Speed transmission. Warn Hubs”
https://missoula.craigslist.org/cto/d/1948-willys-jeep/6253069300.html