Daniel - Below is screen grab of an "Electrolock" ignition switch assembly from this current
ebay ad for an NORS one. The metal cup on the other end from the lock cylinder part is what attaches to the original style coil shown in Tiny's pictures above. There isn't a difference in "distributors", just the coil.
Your choice on if you're wanting to retain originality (but I see you have other alterations planned) or go with a reasonable looking plain ignition lock cylinder switch. It may be simplest to go with a new keyed switch.
