Originally Posted by repechage

That was the color chosen by McLaren Cars during the Can-Am days, just so everyone would see them coming up from behind and move over.

As to a conversion, J.P. Weigle has stated he likes the Raleigh Competition (before the G.S.) as a suitable conversion frame, he does not like the International for some reason, but the geometry between the two is not very different. I never read a follow up to as to the why, there have been a number of public inquiries of late that never get answers.