i don't think the 3 pitch 8t drivers will work , i think the 3pitch 7t ones are about the same diameter as a 9tooth 2.52. the shaft size on the doo's depends on the year,if the 3' pitch drivers came on the doo from the factory it probally has a much larger shaft size like 2.5''- 3". if there off an older doo they could have a 1.25" shaft size or the 1.125" shaft like your viper,it really depends on the year and model of the doo.