mopauly -
Most teams run a gloss gray for their interiors. The most notable exceptions are:
- Dale Sr. used red for most of his interiors
- Tony Stewart usually runs a cream color
- Yates ran primarily red interiors before UPS came aboard
The most accepted color matches for modelers seems to be Model Master Gloss Gull Gray, Testors' Racing Colors Chassis Gray (passable), or Krylon Pewter Gray. If you are planning on using the Krylon, remember to use a GOOD primer to keep the plastic from crazing. Also, here are a few sites you can search for reference photos:
http://www.ciastockphoto.com/
http://www.haroldhinson.com/
http://www.erc.msstate.edu/~roger/rasn.html
HTH
lowdog