For a replacement, you will either have to find out what the model and manufacturer is, contact a glass company to see if they have a seal that would work or just have a different one put in.
They weren't stock from the factory so it's not like someone can just give you a part number to try and find.
Ahh I see sucks, wish it has no sunroof. Chop it off and install another s10 roof and weld? Anybody done it?