This is a NOS vacuum advance unit for the distributor for the years and makes listed below with distributor numbers 1779983 [IBS-4006B] & 1841417 [IBS-4009] . This is a original NOS Mopar part in it’s original packaging.
1958; [see below for specifics]
Firedome; Fireflite; Adventurer; with & without Fuel Injection
D-500; 1958 WITH fuel injection
Fury; 1958 with& without fuel injection