MSD Pro Mag 7456 PRO-MAG Replacement Base for Pro-Cap, Fits Pro Mag

7456 Distributor cap base, only fits MSD Pro-Cap style MSD Billet distributors.

7456 MSD Distributor Base

Mallory 208M 8-Cylinder Distributor Cap Upgrade For 25 & 37 Series Distributors

MSD 7456 Pro Mag Distributor Cap

MSD 84313 Black Distributor Cap for Small Base MSD Distributors