I've got hold of a spoiler from a mk3 gti and want to fit it to my mk3 gl. However, I dont know where the holes for the screws are ment to be located - were they in the glass on the gti's or on the top of the tailgate? Furthermore, is it an easy job to drill the holes or would it be a better idea to try and locate a seperate gti tailgate. Finally, if this is not possible then how good is mastik or a similar substance for this job (will it hold it when going on the motorway for example). Any help would be much appreciated.