Do you mean you can't find an Envoy listed in the Yakima catalog? Just look under Trailblazer - it's the same rack rails up there.
Personally, I installed a Surco aluminum one for a bit less cost. But I didn't like the height their mounting brackets put the rack above the roof, so I customized the mount. Run a search here for "Surco" to read what some of us have done.
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