Does anyone sell these float syncs for su carbs anymore?

I'm not sure. I saw that Z Car Depot recently started selling something similar though. Not as fancy as the float sync, but should do the same job. I bought some fittings that do essentially the same thing as this Z Car Depot product. https://zcardepot.com/collections/240z/products/su-carburetor-float-fuel-level-setting-tool-240z

Oh wow, that's an interesting way to do it. I always used the air tool to synchronize the carbs.

But this gives an extra visualization into the fuel used as well.