They do fit. ABSOLUTELY DO NOT get them.

The leverage created on the two bolts holding the extender onto the original 3T piece breaks the bolts. There are threads elsewhere on ST, do a search but HERE is one

Use the proper 3T Clamps. They replace the existing 3T part with a single unit rather than bolting on the extra clamp like Zipp. Removing those bolts means they can't break.

http://www.trisports.com/...-conversion-kit.html

Hope that helps.

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