Some "upfitters " of light duty Chevrolet and GMC trucks instALL seat assemblies which relocate the General Motors retractor assembly and buckle attachment points with respect to the original installation.
Seat and seat belt locations are determined by General Motors and conform to regulations set forth by the Federal Government
When relocadon of seats and/or seat belt assemblies is performed by the upfitter, the upfitter is responsible for certifying seat and seat belt locations and performance to the Federal requirements and for providing retrofit seat belts or extenders. Comments of inadequate seat belt length and requests for seat belt extenders in this situation should be directed to the "upfitter".
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.