If I can figure out which part is, I probably can pull it from one of the damaged tops that I keep for no particular reason. Is it on the 'arch support' just above the window?
I'm guessing about $30 for shipping due to size and I'd want $25 for the part *if it is in great shape - I still need to remove one and get a look.
Image from Mike Focke's DIY Web Pages:
https://sites.google.com/site/mikefocke2/replacingthetop-adiy
I've been fortunate enough to be able to do complete top replacements on my cars so far, but I have one plastic window with a small crack now and may do a re-skinning this winter.