rotorwrench
Well-known member
There are more than 2 different ones. There is a cast iron for the early 7RA distributor and later I think there was an aluminum one for it. The OBA type cover with the built in bushing was always aluminum but there may have been two different versions of this type. I'm not sure if the last OBA type had a replaceable bushing or not. There may even be another one but it was likely from post production replacement parts. There is a thread on here somewhere about all the different 8BA family timing gear covers. It was quite a while back though and might be hard to find.