If you have them "rewebbed", what actually happens is you send your old belts away, they refurb the metal parts as required, re web (in your choice of colour) and they come back with an 8130 (equiv. to a form 1). So for the paper trail its looks like you've fitted new belts.
I had a set done for a 150 Aerobat (hugely expensive & difficult to obtain from Cessna), cost about £800. I used APS at Lasham (they send them somewhere in the US), door-to-door was about 14 days. Very good quality. (Aeroplane in Perth if you want to check them out).
When I did my Rocket, I put BAS belts (4 point inertia) in the front. There is no calendar life on these belts, and they are very good.
B.A.S., Inc. - Aircraft Safety Equipment and Accessories
There is an AAN to cover most installs, PM if quote required for supply and fitting (in North East Jockistan).
For the rear belts I used a Cessna service kit that added the previously missing shoulder belts. The cost of the all in kit is much less than buying the individual elements, and worked out cheaper than a reweb.