window tracks

[ChrisCom]

Evening, have a 1986 Chris Commander and need to replace the window tracks, that have all but vanished with age. do I need to remove the window flashing on the outside of the windows or will the windows lift out?

 

[Sea Bitt]

I bought some from west marine and could side under window without removing. The old one came out in pieces. New ones are plastic old was rubber and felt.