speaker adapter brackets

i have just found adapter brackets to change the front speakers from 4x6 to 5.25" i have a 1996 sunfire. on crutchfield it says that it will fit the 96 cav, but not the sunfire... this just seems kinda funny... is it that the 2 cars have different cut-outs in the door or will they fit?? any help would be great.. here is the link to the brackets http://www.crutchfield.com/App/Product/Item/Main.aspx?g=103200&i=120823300&tp=2824


thanks in advance!!!