UPDATE: Still Available.
(05/19/2023) Justin, proprietor of Humble History Antiques, has this 24V M-38A1 for sale. Justin didn’t have much history on it, as it was his grandfather’s jeep. While the body is M-38A1, on the rear of the frame is a PTO bar, suggestion the chassis may be a CJ-5.
If interest, contact Justin via p# 978 447 4312 or email jhumble9 @ gmail.com (remove spaces from around the @).
This last pic was pic capture from part of a video. Not the best pic, but you can see the PTO bar:
not 24V, i spy an oddfire 225 and alternator under the hood, suggesting as you said Dave, a CJ5 chassis.