Coronado Kid
Cactus Patch
I have found them they sell all major epa98-06 engines they have cummins signature 600 and 3406 6nz and even more detriots and they have some nice trucks also
http://www.kustomtruck.com/glider-kit-drivetrain-packages.html
http://www.kustomtruck.com/glider-kit-drivetrain-packages.html