I really don't think they will the "after market grill" is just part of the speaker. I can't find any pic's right now of behind the door but I'm sure some body will help me out on that. I would just do some after market speakers that will fit inside of the door just like the stock ones are. try somthing like this: http://www.google.com/products/catalog?hl=en&expIds=17259,17315,23628,23670,25041,26761,26849,27520,27955&sugexp=ldymls&xhr=t&q=5+1/4+speaker+sony&cp=18&safe=off&um=1&ie=UTF-8&cid=8994159134396045583&ei=MXQqTemILcL88Aa2262BAg&sa=X&oi=product_catalog_result&ct=result&resnum=4&sqi=2&ved=0CDQQ8wIwAw# they are not a bad price And should fit in the door.
Brandon