Hot Rods Where to find Mallory YC type distributor cap?

GMC Bubba did a nice job on my YC 312 distributor and it has a nice shiny new cap and rotor but when I drive out on the road, I like to have an extra cap and rotor. I checked out ebay to find nobody including Mallory has a cap for sale for this distributor. Anybody know where I can score a new cap? I found a rotor for sale..no cap.

 

E-bay is about it, other than some of parts boards on Facebook....