Does anyone know if these cog pulleys (link below) will work on my VR4. I know it says for paxton but I'm not sure if it will work on these older blowers or if it is for the newer paxtons. Any help would be great. I will probably call them to find out for sure but figured I would check here first.

http://www.aspracing.com/cog.html

By the way the VR4 is on a 1995 mustang cobra.