You need to get PAC ROEM kit http://cgi.ebay.com/ebaymotors/PAC-ROEM ... dZViewItem
It took us about 5/6 hours over 2days to get everything done. The hardest bit was getting everything out as my BOSE unit was screwed in from the back.
You just need the ROEM Kit, A Micra speaker harness, Aerial adaptor and also a fascia plate.
Bose amp works fine with my alpine setup, just ensure that the ROEM kit is wired properly