Do the seat belts differ according to VIN number?

I've got my MOT coming up and the webbing on the N/S/R seat belt is frayed/slightly cut. Has been like that since I bought the car earlier this year.

Didn't notice it until recently.

I've been looking at various places and some list them as being suitable up to a given VIN number and some are just listing a seat belt for the entire production run.