That distributor housing insulator is available, but you'll need to search some antique farm tractor websites. Farmall, Oliver, and a few othes used Delco-Remy distributors, and the insulators are identical to the ones used on stovebolts. Our local "Tractor Supply Co. " in middle Tennessee has them on the shelf, in kits that include the threaded studs as well, along with points and condensers that are a direct swap with stovebolt sixes.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!