Hi Jim, The diameter of the new roll bar is 45mm and the diameter of the cage i removed is 30mm. Thus the boot cover is prevented from reaching the outside /side fastenings due to the thickness of the bar. I can't get the front fastening on either. I'm not sure that the answer is to trim it yet and just wondered if there was any general advice before making a decision. At first it looks like i need to cut the cover around the 'inside' of the hole but there is a lot of stitching there. I meant to ask at our meeting last week but forgot because there were so many cars there to look at. Rich