Yeah, the 5WS is part of the Utopia line, but they were recently replaced with the 13WS.
Similar in performance and sound quality, but the 5WS is MUCH cheaper now. Plus the mount depth is same as stock. :P
I dremeled about 1.5mm around one corner of the stock enclosure. Literally 2.5 minutes worth of work per side.
That link is to the wrong size for the dash, your looking for 100 V Slim.
http://focal-america.com/Products/Polyglass/PolyglassV2.html