Alpine SPS619 / SPS-619 / SPS-619 6 x 9 Coaxial 3-Way Speaker Set
Picked this up along with a set of 6 1/2s for the fronts.  Overall impression was that they get the job done.  I have yet to order an additional amp to power these along with the front speakers so I'm sure their sound quality will be even better once the amp is installed.  Overall quality and packaging was excellent.  All necessary materials were provided: extra screws, adapter (for other vehicle models).