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      09-17-2009, 01:03 AM   #1
808MGuy's Avatar

Drives: 2009 E90 M3
Join Date: Jun 2008
Location: Oahu, Hawaii

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Bolt circle and spacing of front 4" speakers.

Does anyone know what the mounting bolt circle and spacing of the mounting holes in the factory 4" front speakers are? I'm trying to have a set of adapters machined and need to make CAD drawings but it has to be pretty exact. If anyone knows, it would save me the time of taking the door panels off and measuring.
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