[M9G]

Originally Posted by thstone

Generally, you have to modify the rear speaker mount to fit 3.5" speakers. However, some owners just jam them in there and get them to work. Other owners remove the OEM mounting panel and replace it with a panel with a larger hole.

http://986forum.com/forums/boxster-general-discussions/29236-rear-speakers-diy-guide.html

OK thanks, good to know 3.5 will go in and thanks for the link :-)