I have a 1999 RT-10 with Belanger exhaust, but I made sure I got a complete stock exhaust system with cats etc. to have to bring it back to factory stock.
I recently restored a 1964 Ford Galaxie convertible and as I did it I thought about the kinds of hard to get things I would need on my Viper. A car smashed into the 64 in November and I was glad I had a hood and fender on hand to help repair it. They made 930,000 Galaxies in 1964, so it was not too hard to find most things.
Considering how few Vipers were made I decided to stockpile a lot of items as I found them. I got a front fascia as well as a rear fascia just in case. I plan to keep the Viper for a long time, so these items will help if I ever need them in the future.
Hopefully you can find a place to store some of these parts which may be very expensive in years to come.