SO, i got an 88 model k30 crewcab, and it sat for awhile without the heater box on it, so it got rain in on the firewall insulation, and its pretty nasty. where can i get this new? I looked in my LMC catalog, but thats the one thing they don't carry. Can this still be gotten at the dealer? I definately want it in there, sinces its diesel and its gonna be noisy! thanks.