1961 bubbletop windows

Hi , i`m looking to replace the lower door glass frame on the front doors of my bubbletop and it seems that i can only find impala replacements , so my question is are they the same and will the impala ones work , or where can i buy some buick frames , i have done a pretty good search and can`t seem to find any repro stuff , any information would be much appreciated , cheers Rob

I think the difference between the bubbletop and convertible look GM hardtops was the rear quarter windows and the rear window. The doors all appear the same with both tops. Using the Impala repros should work.