If you have rain gutters and could spend more on the universal type kits, Yakima's clamps are an obvious choice. I think I was one of Yakima's first 100 customers :-)
For an oem rack, what about using Rivnuts into the roof?
Unlike self-tapping sheetmetal screws, Rivnuts have stronger machine screw threads, and make for a clean instal. They instal by drilling a precision diameter hole in the sheetmetal, then instal using a special rivnut installation tool, that is similar in purpose to a pop-rivet gun. You'll want to practice on a scrap piece of sheetmetal before going after your roof, but installing them is pretty easy to master.
Use the rounded-head stainless steel 'button head' allen screws and a dab of RTV (to keep the water out) to hold the rack in place. Use a cut-off ball driver in your cordless drill to speed instal and removal. After you remove the rack, just replace the button head screws, tightening them flush with the roof. Again with a dab of RTV to keep the water out.
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