I will have a go measuring the width on Monday when my new engine mounts turn up. My old XJ has Bushwackers and is currently immobilised in my garage. The garage has a 7ft wide door but the actual aperture is smaller due to the door frame. When I drive my Jeep in I leave an inch of clearance between the door frame and my Bushwackers on the driver's side. I've no idea how much space is available on the other side. When I get my new exhaust manifold and engine mounts finished I will back it out and measure the gap both sides at the frame. I should be able to calculate the overall width afterwards.