Hi y'all,
My best personal recomendation would be for you to send your seat belt for repair at
Ssnake-Oyl
The seat belt in my L81 works like a charm (NOW! That is.) Back in April 2002 they charged me $146.45 for repairing the seat belt assembly by replacing the spring, webbing, transfer my original seat belt labels to the new webbing (which by they way...matched exactly to the factory one minus the accumulated dirt of 22 years), and a reasonable expedite-fee of $15.00.
If you're missing your labels, then they cannot help you, but if the old ones are still good, then they can re-saw them on to the new webbing. Years ago, the new left side seat belt assembly retailed for $445 dollars. Today, they're not available, and if someone like Paragon or Corvette Stop has them, then they are expensive to obtain; however, if repair is what is needed, then give them a try.
I am not sure if this qualifies as a testimonial, but believe me -you'll be greatly satisfied with the quality of work and best of all peace of mind that your love one will have the seat belt in working order if ever involved in a crash.