Posting this information for anyone that has a convertible and wants a clean OEM+ way to mount an aftermarket amplifier.
Looking on realoem I found that cars that came with factory phone/bluetooth have an additional bracket and trim panel that would work as a perfect mounting point. All E46s convertibles have the bracket mounting tabs installed.
Bracket Part: 84136924948
Trunk Partition Trim Panel: 51478236561
Lastly the left trim panel on cars with phone/bluetooth is slightly shorter. You could go get the OEM piece or trim your current piece slightly to fit. I elected to trim.
Attached are pictures
Looking on realoem I found that cars that came with factory phone/bluetooth have an additional bracket and trim panel that would work as a perfect mounting point. All E46s convertibles have the bracket mounting tabs installed.
Bracket Part: 84136924948
Trunk Partition Trim Panel: 51478236561
Lastly the left trim panel on cars with phone/bluetooth is slightly shorter. You could go get the OEM piece or trim your current piece slightly to fit. I elected to trim.
Attached are pictures
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