1980 K100 Cabover Project/daily runner

Finally got off my butt off the couch and bought my first truck. Mainly knowing if i didn't do it soon probably wouldn't do it. This is a 1980 k100 cabover. 25k on an overhaul with paperwork. One rear end has been replaced. Has 8 bag air suspension. Aluminium frame. Has a 228" factory wheelbase. Couple small welds where old spring suspension was. Inside isn't horrible needs to be cleaned. Hasn't been Dot certificated since 2009. Has a Cummins 400. Has one rear end replaced. Old yellow and dark green paint job under current paint was used for an belly dump for two years



Here's some questions.

Where do I do find info on part numbers for new air bags? Couple look dry rotted.
Need info on where i can get a body panel? Front passenger side is cracked due to deer hit before.

There's probably going be bunch more questions I'm going to be asking.

 

Interior isn't horrible. Needs cleaning and some minor things. Cab has some ruse by the sleeper air breathers. Otherwise she is very solid. I'd be the 4th owner

 

Honest to god when i looked at it i think it was a fibroglass panel or been repaired before

 

Always wanted a cabover. This thing drives beautifully. Why does so many people say aluminium frames are bad?