Looks liek this is a MB/GPW tub that’s had a gas inlet installed.
“I have for sale a willys M38 Jeep tub. It has some rust spots but is still in useable condition. I will be taking it to the scrap yard soon so if you are interested in it give me a call. It is on the ground so you will need to bring some friends or have a trailer with a winch to load it.”
oddity – its missing the rounded (machine gun pad) if it is WWII – had inter fendertop boxes, has 2 gas necks CJ style