I don't know about rare, but my sedan has it - got it as part of the cold
weather package (here in the States). All coupes had them. You might
look for an AWD xi - they're often ski cars and have them.
I'm guessing the E46 will be similar to the E36 - my E36 4-door has a metal
plate behind some material behind the fold down arm rest in the rear seat
that can be punched out and the ski bag fitted as an optional item. So far
I've managed to avoid bothering to get it fitted as I tend to just chuck my
snowboarding gear in the back seat.
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