Call Chevy at 1-800-222-1020, have your VIN number ready and ask for a restoration package, that will include all the specs for your trucks year, and a list of chevy parts suppliers.
I highly advise ordering the Chevy Truck Shop manual for your year, American Classic's has it, so does Chevy Duty. It has been invaluable for me.
I have heard the Factory Assembly manuals are very useful also, just haven't gotten around to ordering one yet.
Frank
