I have a set of SWS-8's I pulled from my 335i before I sold it. I made them plug and play and they are ready to go in with the adapters provided. The only modification was to the enclosure in the car. A few of the fins in the box need to be cut for speaker excursion. Search for SWS-8 install DIY like I did before you buy if your not sure about it.
History: I bought these used from another member. I installed them and used them for about a year with no issues. The buyer of my car wanted it 100% stock, so I removed them.
If you have questions PM me.
I'd like $165 firm for these shipped. If they are not sold in a week they go on eBay.
Enjoy.