Does anyone use a Pertronix Distributor?

[Argess]

I am thinking of purchasing a Pertronix D133701 as I want to try a vacuum distributor vs my existing mech one:

http://www.summitracing.com/parts/PN...1/?image=large

I don't have a lot of room due to twin carbs, so I need the max diameter of the dist. Preferably the cap base outside diameter, not including the mounting bosses.

I contacted Pertronix on this and they came back with 5" which seems excessive (and won't work for me) considering they advertise it as having a "small, high-dielectric strength cap and rotor for applications with little clearance."

I think they made a mistake, either picked the wrong dist, or the measurement was to the outside of the cap hold-down bosses. Why? Well, looking at the picture, the cap size in realtion to the dist gear looks the same as my Mallory dist. The Mallory dist has a small dia. cap.

Thank-you.