is seat belt warranty for life I have one on the driver side that coming a part.
We would need to know what car you are talking about before we could tell you.
(OP answered to my wall that he is driving a 1997 Nissan pickup)
In that case, yes, Nissans had a lifetime seatbelt warranty at least through 2002.
The caveat is that Honda has a lifetime warranty too, but convincing dealership service departments of this can sometimes be an uphill battle.
I knew a guy who got his Honda seat belts warrantied
At first, they didn’t want to give him the time of day 
But a case of beer cut through the “red tape” :naughty:
The Nissan site shows that seat belts are warrantied for 10 years/unlimited miles but only has information for 2003 and newer. I would expect a problem with getting a dealer to honor a seat belt warranty on a 19 year old truck without evidence that a lifetime warranty once existed (bring your warranty booklet).
"I would expect a problem with getting a dealer to honor a seat belt warranty on a 19 year old truck without evidence that a lifetime warranty once existed (bring your warranty booklet)."
I would expect a problem getting a seat belt. When I worked at a European/Asian car dealer, we would have never kept, nor been able to order a seat belt that old, especially if they came in different colors.
CSA
@Nevada_545 Correct. Pre-2002, they were warrantied for life starting in the mid/late 80’s.