They have 2bolts at the bottom that attach to the regulators. You just take off the door card and there are peep holes that line up the the bolts so just take the bolts out and slide out the top. job done
Cheers kammy. Yeah that's what I did although the peep holes are little further down so had to wind the window down a little to get the bolts in line with the peep holes but then-as long as you stop the window from slipping into the door (I found a few strips of masking tape or a friend held the window nicely). Fitting the new ones is simply a reversal of the removal