Here is some info for purchasing some rust repair panels for the rear quarter panels:
212-92-51-L
212-92-51-R
Rust Repair Site
Click on "order by part number" button in the upper left of the page and enter one part number per line. The current price is $32.35 per panel, but well worth it. Shipping is pretty reasonable as well.
I have had mine on my VX for over a year now and they are holding up very well. I had a buddy cut and weld them in for $400. In the future I will do it myself as my welding skills have improved greatly since then, plus I really didn't want to try it out on the exterior of my car, lol. It's just that he had the flanger and I didn't.