Help ID'ing this heat exchanger
 

Guy on the 'Book mentioned he's looking this again, he had last researched it here on tech:

"Many many moons ago pre Facebook, like LS1 Tech days this little factory radiator was real popular to use as a W2A heat exchanger. It was super cheap like $50-$60, only had a 3/4 hose in-out connections. No filler neck, no built in transmission cooler, and around 13 1/2” x 30” in size. I can not remember the application and spent hours trying to find it with no success. Anyone know?"

https://cimg1.ibsrv.net/gimg/ls1tech...ad8bcd04aa.jpg



https://cimg3.ibsrv.net/gimg/ls1tech...9a5c5c54dc.jpg
https://cimg7.ibsrv.net/gimg/ls1tech...512cc12857.jpg