if putting stock exhaust manifolds on your car is the case why not just keep the ones you already have on your 04, they are the "stock" ones and not to mention a lot newer than the older year ones you are looking for, investing on a good pair of headers isnt a bad idea, bbk has cheap headers for about 270 bucks and JBA has good headers but you will end up paying around 439 bucks, americanmuscle.com is the place to find them. As far as the question you had if they will fit your mustang i dont know...sorry.
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