I'm afraid it's stashed away in a garage that is hard to get into at the moment. I think I have a photo somewhere. I'll see if I can find it and put it up on Imgur or somewhere, then post a link. You'll have to extrapolate a measurement from that. A quick look found one on a RHD red 142S without the carbs on so it might be possible to make a guess at the measurement. I do have one of the exhaust on the ground by itself which may or may not be be more useful.
https://i.postimg.cc/prx7LptK/142-S-1970-Factory-build-with-box-type-header.jpg
This one apparently a build for a Australian customer. It might have been mentioned here somewhere?
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