20mm, more than likely wont be thick enough to bury the stock studs in the spacer, usually need 25mm. They will stick out around 4mm so the wheel will sit against the studs and not the spacer. You can cut or grind the factory stud about a 1/4" off, use the short lugnuts that come with the spacers and thread those on before cutting. Once each one is cut run the nut up and down the thread to clean any burs off. Some people may not agree with this, but many people have done it this way with no problems. Test fit everything, if you need to take a little more off, do so if needed.
I have steered away from removing the factory studs and going with ARP extended due a few rare horror stories of them coming loose from the rotor and the lugnut and stud just free spinning. Once that happens, you are in for a fun time getting the wheel off.
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