Can NOT fit any tires on just the rim. Make sure to put them on the wheels.
Your tires are too wide for the wheels you got. They are the original size for 20x9.5" and 20x10.5" wheels.
They might fit, but many installer will refuse to put them on for liability.

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00 E39 DINAN S1 //M5 (82k miles)
06 E53 DINAN 4.8iS, born 2/18/2006 (126k miles) http://www.xoutpost.com/bmw-sav-foru...s-my-dslr.html
90 Straman Z32 TwinTurbo Convertible, (1 of 44 ever made) 5 speed, 444rwhp/451rwtq
01 360 Novitec Spider F1 (26k miles)