OP, not sure what "standard length" clubs are, but my clubs fit fine. Try tipping the bag so the club heads go in first into the corner closest to the rear lights, then fit the base of the bag in. I do it all the time in my e90.
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'13 335is convertible (manual)
'11 X3 xdrive35i
'15 Sienna Limited AWD (road tripper)
'06 330i MT, sport,premium (retired)
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