They look like an aftermarket nock off of a flat slide Mikuni. I noticed that Steadfast
doesn't give much info. They need to provide the width of these for side by side mounting. Mikuni's are too wide to fit on many side by side set ups so I'd want that dimension for sure. RE Interceptors have a fair amount of spacing between the two carbs, so they might just work. I'm not sure whether they would work on the Connie "Y" manifold or not though.
The other worry would be quality control. If they are a Red China made product, they might have issues. If from India or Taiwan, who knows?