Seat Belt Problems of Chevrolet K1500

My vehicle failed massachusetts seat belt test. They dont lock when pulled on quickly. I have removed and inspected them and it appears to me that the mechanism itself is not capable of passing this test I am believing that the test has been implemented after the manufacture of this particular design of seat belt, and am asking if this vehicle has been grandfathered for this test there are intertia weights in them that will lock them in a collision, and I have tested this in a wide open parking lot by slamming on the brakes and they do lock but my inspection station is unwilling to recognize this I wish to know what I need to do to get a passing inspection sticker on my vehicle is there a recall for and updated design of seat belt ? I find it hard to believe that both existing seat belts in the vehicle are "bad" will the NHTSA assist me, please ? thank you.

See all problems of the 1996 Chevrolet K1500 🔎.

This vehicle is equipped with seat belts incompatible with the seat height. The lap belt portion exits the retractor assembly at an extreme angle thus causing excess wear in both the belt fabric and the retractor cover. The belt also becomes entrapped in the slit cut in the belt retractor so it won't retract and becomes entangled in the door as it's closed. Due to this design flaw all the available replacement drivers side parts have been consumed and no redesigned parts have been produced. Even if the replacement part were available it too would soon become worn to the point of questionable serviceability within a fairly short time. I contacted Chevrolet and was given reference # 71-1330000620. The representative contacted the local dealer who confirmed parts no longer available. The representative refused to open an investigation into the matter simply stating parts don't last forever. There are thousands of these pickups still on the road and any of them driven by tall drivers with the seat fully back will have the same wear pattern. I tried getting the part from salvage sources and found all compatible parts were either sold or in the same condition as my worn part. I did make a modification to the seat belt retractor housing with some diagonal cutters to alleviate the belt becoming entrapped in the slit but the belt is worn beyond safe limits and since the exit angle is still incorrect the wear will continue despite the cover modification. I agree parts don't last forever but a poor design rapidly accelerates their failure and puts thousands in jeopardy, especially in locations that don't have a vehicle inspection program in place.

Driver's automatic lap belt fails to extend from retractor w/buckle not remaining latched once fastened.