I don't think your link works properly.
But generally, you just need a mounting kit that fills the Din-and-a-half mounting hole gaps around your Din-sized stereo.
I recently switched from an Aftermarket Pioneer Din-and-a-half sized head unit to a Din-sized head unit, and because I really do not like the big spacer all around a Din unit mount, I got a mounting kit that at least made use of some of that space for a little pocket that can hold a few CDs.
See it in my "after" pics in this thread:
97 SE, teflon wiper blades, Dunlop Sport A-2 tires, Leather steering wheel cover, Pioneer DEH-P480MP mp3 CDRW head unit, Pioneer 12-disc changer, iPod hookup, Boston Acoustic 3 way 6x9'*, Boston acoustic separates in door pods, Alpine 4 channel amp in trunk. Magnaflow dual outlet muffler and Ractive stainless tips. Autozone rice pipe and K&N 4750 intake kit. Clear corner lights. Energy Suspension end links.