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No worries, Flip.
I think I've sussed how your system works now.
It looks like the flanges are captive, in that they are held between the two end welds on the short terminal sections closest to the heads.
Thus the first short section of header tube is bolted to the heads, with subsequent sections connected to each other via spring retained slip joints.
This is a different set-up to the others which have a short, straight, machined stub bolted in via loose-fit flanges, with the first proper header section being retained to those by springs which connect directly to the flanges.
..... if that makes any sense.
I'm still curious as to whether there is a step where the headers abutt the exhaust ports on your system but its academic really so I don't think there's any need to go rummaging with the vernier .... but thanks.
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