Where might I be able to find a frame for a Peterbilt, or have one made?

I'm looking to restore an older Pete 378, or possibly convert it to a 379 EXHD. However It needs a new frame (It's not damaged, but it's too short). Is there anywhere around the Kansas City area that specializes in truck frames?|||Just about any commercial truck repair center should be able to tell where there is someone that will do what you want. It is very common to have truck frames extended or shortened as need.