Rear-Shelf 4×6-to-6.5-Inch Speaker Adapter

Adapter for fitting most 6.5-inch speakers at the factory 4×6 rear-shelf positions of a 1981 BMW E21 320i without cutting new holes. The creator reports successful physical fit and sound. Check magnet depth, shelf clearance, fastener security and wiring before installation.

Fitment: 3 Series · E21
Years: 1975–1983
Materials: ABS, PETG
License: CC-BY
Contributor: martin check (cwf95gsx)

4x6_to_6.5_speaker_adapter_bmw_v5.stlSTL ↓

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