I picked up this 4 speaker kit on Amazon for a mere $150 shipped (drop shipped from Germany).
https://www.amazon.com/gp/product/B00MX404SO/ref=oh_aui_detailpage_o00_s00?ie=UTF8
It arrived in 4 days via FedEx. It was reasonably well packaged. Shipping box had some damage but the product boxes themselves were unscathed. Here are some pics and my impressions...
Comparing the stockers to the Qe120's:
The rear deck speaker thrown in for comparison...
The rear deck mounting rings and speaker terminal adapters...
The rings allow these new 120mm speakers to fit into the rear deck. They lined up well, and installing the rings was a breeze.
The first snag: When I popped the speaker into the ring, it was loose. There was about a 1/16th inch gap which would allow the speaker to flop around. I tried bending the metal mounting tabs to no avail. So I had some gasket material I had leftover from a subwoofer build. I put that around the edge and the speaker fit perfectly. I wish it wasn't white, but I had it on hand.
I hit the second snag installing the front dash speakers. The metal mounting tabs on the new speakers were slightly different. I had to do some bending of the tabs to get them to engage properly. A minor frustration considering they fit perfectly.
I'll be back soon with my SQ impressions...