All the hole line up and it fits the carb perfectly but the shape of the base is a bit longer than the oem boot. At first I didnt think it would be a problem, but as I bolted them in place, the metal base started to bend. Bowing down at the ends and arching up in the center. Not good.
Will be looking for a real oem set.
Good news is that after taking off the old boots and inspecting them- they actually seem good- no cracks, still flexible but the orings looked a little worn. ( I think that it was leaking at the base.)
On any other GS's you'd just change the orings, but the "oring" on this bike, or boot at least, is a built-in lip on the manifold boot. I think that this is a "pre-78" thing. The fiche for '77 gs400x (what I got) has no o-ring, while the fiche for the 78 gs400x has boots and rings. Im gonna order from the 78 list.
When I reinstalled them, I added one of the "carb gaskets"- pink rubbery paper material, looks like baseball card gum- in between the boot and the spacer block. So far so good. No leaks. The gaskets are like $3 each, so if anyone else has these wierdo boots - this may be the cheap and easy way to get a little more life outta them.
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