The sources already named are good. I just thought I'd mention something real quick if the stripes are a concern.
I just finished a Viper a few months back but had problems with the original decals being too brittle. I took the sheet from a spare kit I had and while those decals were in better shape, the fit over some of the wing details didn't work out. If you have the same problem or would rather paint the stripes, Russian Marker Red was a perfect match for the color of the decals on mine.