A front crossmember has been added. Sometimes that means a different engine has been installed.

“1951 Willys Jeep in excellent condition with new tires and spare, new clutch, new master cylinder, new water pump, new carburetor and miscellaneous other new parts. No rust, seats in excellent condition, 4 low/high and all electrical works fine, includes spare fuel tank mounted on back and tow bar. Have used it primarily as fun vehicle to ride around property and tow trailer for chores the past four years so ready to find it new home with someone who can use and enjoy. Unique and fun vehicle! Interested buyers only please.”

https://atlanta.craigslist.org/eat/cto/d/1951-willys-army-jeep/6321786801.html