If you don't kill someone with the metal blades, you'll need a new hood if it ever comes apart on you. Go with OEM only on the fan blades. The aftermarket ones are of questionable quality and reliability.
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(Summer) 2001 330Ci - ZSP
(Winter) 1994 530i "Greenie" - PARTING OUT! (PM for details)
(Grocery Getter) 2002 525iT