1998 Ford Explorer XLT rear tailgate window

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I'm not sure what you mean by wrong size, however I can share my experiences which might be usable to you. I got to close to mine with a weed-wacker and picked up a small rock. It pretty much exploded into a zillion little pieces of glass. Took it in to have it replaced which was done. It seemed fine, but a couple days later it didn't close properly so I took it back to the glass guy. It was more to the left than the right so I told him it needed to be aligned. As it turns out, some of the small pieces of glass had gotten down into the latching mechanism, and made aligning it impossible. After cleaning out the latch it lined right up and closed properly. RJ - 98XLT 93k