I ended up using 470's. And some members like 330's. The LARGER the value of the cap, the more bass that is allowed to stay in the door speakers. I tried a 235 and it just took TOO much out.

But I SURE like this mod!!!!!!!!!! Taylor Swift and Kelly Clarkson and T'Pau and Jackson Browne and Meatloaf never sounded better!

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HEY, wait a minute - is that a NON-POLARIZED capacitor? The ad doens't specify... trying to dig up something on it.
I REALLY don't think that is a non-polarized cap. The others in the series aren't.

Try MOUSER.COM! You can search using their site and specify non-polarized. Their prices are at or below Radio Shack, but of course, you'll pay shipping.