Another good parts dealer
 

Performance Distributors.
There was a thread going about DUI distributors a couple weeks back. I bought mine from Performance Distributor more than 10 years ago. I was very happy with their product and service then.
Well, I damaged an advance spring and broke a part on it while working on the motor. Called them for replacement parts. Keep in mind these were custom built distributors (Ford 427 FE motors) made more than 10 years ago.
They still had the original build sheets for my distributors!
Had my parts in a couple days. Couldn't be happier.
Gary