clarion plates

I have a set of Clarion 4x6 plates from 2001 or so, they have the 4" woofer and 1" tweeter.  THey work perfectly however one of them has a fried capacitor. I am assuming the capacitor is part of the crossover network but when it fried it let out a loud pop. This was back in 01 when it happened and after they popped I bought a capacitor with the exact same value from Radio Shack, replaced it and a few months later it did it again which is why they are sitting in the box till this day.

My little brother just picked up a used Blazer which just so happens to use 4x6's in the dash. Rather than see him spend money to replace the speakers I figured it was a perfect time to get rid of the 4x6's that have just been collecting dust in my garage.

Anyone have any idea how to remedy the capacitor popping issue? Is the Radio Shack capacitor I bought crap? Is there a better place to buy one that will last?

Thanks

the cap that came on the plates is a 10uf 50V

Would this work as a replacement: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=027-340