i'd keep looking for an oem hitch kit. i've heard horror stories of aftermarkets. i know they're hard to fine, but keep looking. i must say i am quite disapointed as to how bmw dropped the ball on the e53 hitch availability.

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'90 E30 M3
'05 X5/3.0 Sport (E53)
'03 540i/6 M-Sport (E39)
'91 325i/5 Sport Package (E30)
BMWCCA #360858 SCCA# 374179