Needing your HELP!!!

I have a 1995 Celica convertible. My problem is finding the plastic guides for the side rear windows. the ones that slid in the metal track. there are three in each side and there all broken. I've contacted the local dealer, with not luck in getting the right part!! I can't find any in the junk yards and I'm looking at paying to have a local machine shop to make them for me.
I'm looking any help locating the correct parts!! If you have any Ideas I'm I would love to hear from you!!!!
Thanks
Dave