Factory Peterbilt 379 air suspension between cab and sleeper.

I have a 1994 Pete 377 with the 63" Unibilt; I've tried & tried to get the passenger door to close right without having to get in and slam the door as hard as I can. I had given up, and decided to just not use that side -- then I found this thread. Many thanks to the OP for posting the part numbers!!!!

I just bought the lower mount and upper plate through LKQ for just under $400, including shipping; I'll get the air bags through Amazon for under $100. One point I want to bring up is that you don't have to get these off of the same truck -- my lower mount came off a 2003 Pete 357, and the upper plate came off of a 2005 Pete 379; as long as they are the same part numbers cited by the OP, they will bolt right on.

I'm on the road now, but when I get home December 1st, my passenger door will finally close right!

 

Just found this posting. My 1999 379 has this airbag setup from the factory. Works perfectly! My truck also has the 70 inch "Bed & Breakfast" sleeper as they call it. Official OE name is the ULTRASLEEPER. Mine is fully controlled by the rear sleeper air ride valve. I finally had to replace the air bags last year (leaking). Both my cab doors sit perfectly square in their openings & have never leaked (water or air). Truck just turned 2m miles Tuesday. IF you don't have this factory cab air suspension system, GET IT.