Charger/Commando valve covers.

toolmanmike said
I believe the fins are all the same. @CudaChick1968 can chime in. The spark plug wire insulators are the same for 65 and 66 and of course the 67's are double wire holders.

I thi k 67s are different. You have a small square hole in between the loops. That's where the insulators hook up.