200kPD100

Hi all Im having trouble fitting a new rear window ive had the old one out and replaced the winder mechanism too so new panel going on, Ive tried doing it with the quarter glass and with the window first but neither are working? Is there anyone who has done this before who has any advice on the order or how to slide the window in.

I recently changed the gearbox and clutch on my fabia atd pd100 after having wheelspun up a hill the gear changes became suddenly very difficult and reverse lights engage even when not in reverse however I can turn them off by pushing on the shifter all the way forwards. This and the fact it is easier to move the shifter right than left leads me to believe its linkages but is there another possible problem and how do I adjust the linkages. Thanks