Anyone installed the rear speaker kit?

I am in the same quandry as I am building my own system from the parts rather than doing the whole kit. My idea is to use 4 2-way speakers rather than the Becker full range units. I hope to get better highs this way without having to add a tweeter. So far I had a snag as the JBL GTO325's were too large for the bracket. I just ordered some Rockford Fosgate 3" speakers that should fit. Iwill let you know how it turns out. Jamey at Paris Audio uses (1) 3.5" Eclipse 2-way speaker per side and says it sounds much better than stock. I would hope two 2-ways per side(even if in parallel) would sound even better.