You can check aftermarket Lloyd floor mats. They are custom tailored for 1997 Viper GTS and can be ordered in any color. The greatest thing about these floor mats is that you can order them with official Viper logos and choose custom binding in any color if you want.
You can also choose any type of carpet material /thickness.
Check Lloyd mats on this page: https://www.carid.com/1997-dodge-viper-floor-mats/
Examples of the floor mat logos:
Trunk area mat is available too!