once you get your old panel out you can compare the bolt holes and as needed use a small file to take out2-3 mm toward the glass the size of the holes and lugs does vary by a tiny amount as i have compared quite a few panels and on some i found that the front locating lug needs to have about 2mm filed off the bottom edge but once you sit your panel in the runners all will become clear,as for shaping the front edge to suit the contours of the roof on the first one i layed a piece of wood on the garage floor layed the panel over it at its centre point and applied pressure to the outer edges dont try to shape it all at once you dont want to over do it i had the panel in and out a few times checking bending checking the second one i done i got the panel against my knee and pulled it backwards using the same checking method .
couple of pics fitted


hope this helps,keep it to yaself tho,keep the prices down