I'm getting ready to pick up some new speakers for my 2006 TR that does not have the upgraded sound packages. Can anyone advise me of what size speakers to purchase? I am not adverse to drilling a few holes or making a bracket, but I'd like to avoid it if I could. I'll be buying Polk, as they are my favorite brand and I have been using them for many years. (And Crutchfield is having a sale on them!)

Any help would be greatly appreciated!