Can anyone please help me with the dimensions of the stepped adaptor that fits into the lower throttle housing - where there is a large hole on this example pictured? I located a couple of these dull-chrome units recently and they have a larger hole compared to the later bright-chromed unit that I currently have.

email (option): rays54@hotmail.com

Better to just make one out of a stainless bolt. Your Throttle housing & bowden Ferrell dictate the dimensions.

Thanks - it was the the length of the section that protruded from the throttle body I was interested in so my question was poorly phrased.

I dug around the net and came across this which has answered my question.

email (option): rays54@hotmail.com

Nice original one by looks of it