377 Pete. rebuilt/customize getting noware

Hey i work for a fleet truck company (associated food stores Inc.) and were kinda rebuilding this 1988 377 peterbilt, and heres the breakdown.

We want to customize it to make it look really nice and use it for a wrecker and a day hauler.  (kinda as a spare truck)

Heres a couple things about it:
Its completely torn down to the frame and i have already repainted the hole thing.
were not going to put the sleeper back on so we modified the rear cab opening to be a window.
Were going to build a headace rack and some boxes for tools and equipment for use as a wrecker, but we will not be putting a wrecker body on it, were just going to use one of those hooks that slides in the fifth wheel hitch.

so here is ware it get complicated.

We would like to put dual air cleaners in it cuz it only has one on the pass side.  however we have 2 other truck here (same model but 4 years newer) that came with dual air cleaners, so im wondering if i can just cut the hole in the cab and firewall and put in the nutserts to mount another air cleaner on.
i figured there would be an aftermarket kit out ther for doing this and im pretty good on the internet but so far turned up nothing.  
Were gonna put dual exhause stacks but thats easy we got that taken car of.
Now for the interior.  
Really thers alot of broken plastic parts on the inside of the truck, and the dash is old and busted, so i was kinda hoping i could find a complete rebiuld kit for the interior of one of these trucks. (like an aftermarket package) cuz the door panels are bad the steering wheel is torn... basically it all needs some tlc so a master package for the interior would be great.  i just havent been able to find anything like this.  So if there is such a thing or anyone has any information for me please let me know.

Im new to customizing trucks, but definatly not to cuztomizing all sorts of automotive and marine vehicles... so im hoping to get some direction on whats available to me.

thankyou

-Zach  

for the aircleaner just look at how the one on the pass side is mounted and do the same on the drivers side, and get the ducting and rubber boots from a junkyard. measure from a couple different spots so it is in the same place. as for the dash and interior, that is gonna cost you. basically the only place to get replacement dash and interior pieces is either from a dealer or a junkyard. the cheapest way would be to get the dash from a junkyard and then paint it or do whatever you want to it. basically there are between few and no aftermarket companies that make replacement parts for semi interiors.  
1996 Ram 2500 reg. cab longbox, #6 plate, 191 Deliver valves, 60 hp injectors, star wheel turned up a lot, AFE Stage 2 intake into a Phat Shaft 62 wastgate set at 40 psi, 4" straight pipe, Auto Meter Gauges, ATS tranny and TC (unfortunately), Dick Cepek FC-II A/T 265 LR16 (good tires). FS-2500 Bypass Filter. The only hands that work on my truck are my own.

Member - Blowin' Smoke Gang

THE 377 should have cab and interior parts in common with other petes in the 37* family, The 379 pete is one of the most customized trucks on the planet.Google east coast largecar, also try www.largecarmag.com follow some links you should have no trouble finding lot of stuff
Good luck