|The warranty was "lifetime" per the owners manual but the parts are NLA and the dealership doesn't owe you anything.
Typical 10 year NHTSA is all that applies in real life.
None of the regulations or statutes administered by NHTSA require manufacturers to provide a lifetime warranty for seat belts. However, NHTSA has the authority to require manufacturers to replace seat belts under certain circumstances.
Bernie Bilski firstname.lastname@example.org
President of Z-Car Club of Northern Virginia
1995 Nissan 300ZX TwinTurbo in Cobalt Green
1997 Nissan 240SX SE in Ultra Red
2006 Nissan Frontier SE in Ultra Black