JL Audio did confirm that the bottom bracket was not right. It turns out that the screws are the right length but the bracket holes were supposed to be drilled down (inset). They will be sending me a new one.

It turns out that I just needed to wedge the box in a little harder to get the screws to align. What a tight fit! Well the woofer is all installed now. Next I need to mount the amp and wire it all up.

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[Sold] 2004 X5 4.4i - Sterling Gray - Truffle Brown, Sport, Preminum, Rear Climate, DSP, Sirius, PDC, 132's (19 inch wheel), Comfort Seats
Dynavin, JL Audio Stealthbox, Alpine PDX-5 Amp