You bought the TJ used, I take it? Does the top itself say anything - like a Bestop sticker?
I'd recommend going to this page
, and trying to see if you have the factory top or the Bestop aftermarket, or something else.
And once you know what you've got, give our support team a call - 800-845-3567. I'm not positive which window replacements will fit which tops. (It gets confusing). But they'll know.
Odds are you have a factory top. So we may not be able to supply a replacement, and may send you to Mopar. But call first to double check.