looks cobbled up to me, the fan housing/motor looks a Chev car unit [under the hood] and the 'box' with the defrost tubes looks home made - plastic covers are just something that was handy to block the holes ... definitely not factory

I'd suggest you make a wanted post in the swap and get a correct AD heater .... see if you can identify that core for sure, it may be worth the price of a correct heater for you ... about the right size/shape for tri5 car, but tubes aren't positioned right

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot