This is ridiculous. Sorry you got shafted like this. What radiator guy in his right mind thinks that's sufficient? It's not like he didn't see what it looked like when you dropped it off. If I were you, I'd show him a picture of mine and have him do it correctly - and on his dime/time. That's totally unacceptable. That said, I'd put that on the shelf and just get one from Gound Up. That's never going to seal in the heater box without a ton of work.