I have decided to install a Duraspark distributor and hook it up to a MSD 6AL. I have a 66' mustang with a 302 4bl 5sp roller cam. I have learned from VMF that I should get the 85 GT distributor w/steel gear. I got on Cardone's website and came up with part number 30-2831. I ordered the distributor from the local parts store today. I went ahead and bought the MSD distributor cap for the 85 Duraspark. When the distributor came in, it is the smaller (more stock like) size distributor. Weird. I had the parts guy pull distributor caps that their system called out for the 85 distributor and all were the larger caps. Can someone explain to me what might be going on?