1971 B body no AC heater box question

Hi guys, need some help on our 71 RR no AC heater box resto., thought I had pics of everything, BUT,
I didn't get one of the side of the one air door that has the plastic hump riveted to it.!!

Well, now that it's apart, I need some direction on orienting it the right way when re-assembling.
Can you help?

Thanks, Joe

I think I've got it figured out, there's a relief notch on the plastic hump that allows it to clear one of the tubes to the heater core.

Joe