If you still have the OEM depth spacers, here is the aftermarket ring kit you can purchase to mount aftermarket speakers to the ring kit and the ring kit will snap back on to the OEM spacer.

http://www.ebay.com/itm/Metra-82-660...90505164355%26

This kit will save you from having to retrofit aftermarket speakers to your door. Everything will bolt back into place without any rework.