No Sewing Needed! 
Replacement seat back strap kit for many kayak brands, many older kayaks, including Wilderness Systems Phase3 Seating and Dagger and Perception Zone DLX outfitting, as well as classic Dagger and Perception outfitting, and can be used as a P&H non-ratchet seat back strap part numbers 5BSR and-or 5BSNR.
Kit contents: 5 feet of 1 inch webbing strap, one super lock and one tri-glide, with instructions. ZONEDLX
Ideal for use with Wilderness Systems brand kayaks outfitted with a Phase 3 seat, Perception and Dagger Zone Seating or any kayak outfitted with a similar seat strap. (This might be used for some other brand back bands too.) This kit will create a strap 32 inches in total working length, trim shorter as needed, in two parts, with a super lock adjustment fitting. The small photo to the right is shown so you can see your end result.
No sewing is necessary! Some fabrication is required to seal strap ends and make screw holes (see links). Mounting hardware is not included, original hardware can be re-used in most cases. See all the Phase3 Seating replacement parts. See all the Zone Seating components. See also the Seat Strap Kit. Comes with instructions. PERZONE
Related Videos:
Strap Repair Part 2 of 3 Cutting straps and melting screw holes.
Strap Repair Part 3 of 3 Strap install, working with tri-glides and buckles.
