Mike spotted these frames for sale.
https://fresno.craigslist.org/grd/d/sanger-jeep-frames-m38a1-military/7275442311.html
“Here are two military army 4×4 M38A1 jeep frames.
Both still have the machine gun mount attached.
$400 each choice or $700 for both.
I also have Willys MB and Ford GPW frames”