anyone know of an alternative to MSD cap

I have a billet distributor in my 360 dart to go along with my fuel injection. Now I need to index the distributor rotor. Which means cutting a hole in a cap. So can I go to the store and buy a generic cap that will fit, has female terminals. and doesn't cost mega bucks like the cap that came with my distributor? If I were on a road trip and needed a quick replacement cap what would I ask for at the counter? anyone know?