I posted a thing waaaaay back about it Charlie, but here's ya a quick take on this....
I found a set of those old "Chopper-style" big ol' pointy ones(that people would put on their chopped Triumphs back in the day) at one of those shops that specialize in restoration of old m/cs(the SoCal located "Garage Company" in this case)...took it home...cut it in half across from where the tightening bolt is located...took 'em to my grinder and first grounded out an addition 1/4" around the inside 'cause even that style of clamp's inside dim is about 1 3/4"(but there's still enough of the "ring" to take that additional 1/4" out without it gettin' too thin to weaken it...and this is why I used these pointy ones, 'cause the other "classic" style ones don't have that extra width in order to do this)...then I grounded all those pointy suckers down so they were round like on the old Triumph header clamps...and then once those were all in the same general shape, I bolted 'em up on the headers as close as I could to the cylinder head. And nope, even though they're only held in place on one side(due to cutting them in half) you don't have to wire up the two halves at where they're cut. There seems to be enough of a grip to hold 'em on with just the tightening bolt on that one side.
