Do you have the original seat belt including hardware? Is yes then you can send it to a restoration facility and get webbing color and design that would match original.. Go to this link http://www.ssnake-oyl.com/
If you do not have the hardware you should find this at a salvage yard and have it refurbished - hardware and webbing. Using a restoration service will be expensive. As mentioned after market would save money.
If you do not have the hardware you should find this at a salvage yard and have it refurbished - hardware and webbing. Using a restoration service will be expensive. As mentioned after market would save money.