looks like a shifter boot mounted in the driver side air box... so far, I've only found that is a relief area to allow the brake master cylinder on a 69 and 70 Hemi Coronet to not hit the air box (thank you Brett!)

I've got a 69 R/T, and it's got some weird funky drivers side replacement air box, so now every time I look at another N96 equipped 69 Coronet, I am wondering if I'm going to see the usual, or something weird

https://www.facebook.com/photo?fbid=886293322429993&set=pcb.886293349096657

these screen grabs are from an episode of a tv show that restores Mopars https://youtu.be/vK5ozijAKLA