Upgrade Bose woofers on Mercedes SL500 (R129)

The R129 Mercedes-Benz SL class comes with some good Bose speakers and AMP. I decided to start the upgrade process with the door woofers. The stock ones are 1 Ohm and there is almost nothing on the market with that resistance. Based on other retrofits I opted to go with a 2 Ohm woofer. The system I bought is the JBL GTO608C. It comes with separate woofers and tweeters.

SL500 replacement woofer
Back comparison of stock and aftermarket
Notice the stock paper Bose woofer with water damage.

To avoid cutting wires an adapter was used.

Adapter (bottom) ready to plug into aftermarket 5V RCA out stereo.
Adapter connected.

The fit was perfect in depth and diameter.

Installed look of the JBL woofer.