Wow, that's good to hear, I thought I was becoming mechanically dis-inclined for a minute?
I'm not so sure I really need to install them, I just figured they were already in there, & they were probably dirty & should be replaced.
I'm a little curious as to where the cutouts need to be made. Anyone have any good pics showing this? It's no biggie, but if someone can post photos, that would be cool

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Thanks for answering my original question anyways!