TJ found this nice looking L-161 for sale. Though it is picture with a tranny, tc, and OD, it sounds like only the bell housing goes with the engine.

https://www.facebook.com/marketplace/item/1121698265752054

“Running L-161 flathead engine. I believe it’s from a 1951 Jeepster. It has been reliable, runs well and doesn’t smoke. It’s bolted to a T90 and that bell housing will go with the engine. I will be keeping the starter and alternator, but everything else goes with it. The exhaust manifold has either been modified or repaired at the pipe flange, I can’t tell what the purpose was, but it bolts up to my CJ2a. It’s still in the Jeep and I can show it running. I’ll pull it when I have a buyer. $900 obo or trade for a running L134.”