If it's just a flat piece, go to a local glass shop and have them cut you one. I broke the drivers side front sliding glass on my Vegas. Thor wanted like $1600 for the entire assembly. That and it would have probably taken a month to get. I'd go to the supplier before I'd get one through Thor.
Instead I went to a glass shop and had them cut one for $120. Same thickness, same temper/safety rating, same radius at the bottom corner. It took them a week but I told them I wasn't in a hurry. If it's a good glass shop and they know you need it quickly, it's something that should be able to be done in a day or two.
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