Get the Dye Foam, I doubt the empire foam is made to fit the i4. I actually just replaced the foam in a pair of Sly Profits today. Be prepared to supply your own adhesive. I went to Wal-Mart and purchased Loc-Tite Epoxy for Plastics (make sure its for plastic). Make sure you clean all of the old foam and glue and use some rubbing alcohol to get any left over oils or residue off. After everything is clean and dry, mix up the epoxy. Using a flat stick or putty knife, apply a thin layer of epoxy all the way around the surface where the foam mounts. The tricky part is now holding everything in place for about 3-5 minutes until its set enough that it doesnt peel back. make sure the foam lines up nicely as it sets, and try not to get it all over the place. Good luck, mine turned out pretty well, I'm happy with it and wouldn't hesitate to replace my foam again.