[Opeler2]

I have 2 GT'S a 69 and a 73 They appear to have different distributors the 69 has a seperate advance and retard vacuum unit, The 73 has a single double acting unit. The 73 also has a notch in which to lock the cap into the proper position. The 69 does not seem to have this feature. Question is do they both use the same cap and rotor or is the 69 a queer one.

 

[RallyBob]

Yup, there are actually three listed Bosch caps for Opels. The later two are essentially interchangeable (the plug wire fitment is different, that's all), but the early style will not interchange with the later and vice-versa. The distributors are distinctly different.

Bob

 

[tekenaar]

Early vs. late distributor cap locators

Yup, there are actually three listed Bosch caps for Opels. The later two are essentially interchangeable (the plug wire fitment is different, that's all), but the early style will not interchange with the later and vice-versa. The distributors are distinctly different.

Bob

Here's what Bob means pictorially.