I few weeks ago I did the 63" swap and just got around to testing the rear flex and clearance. I did some trimming but the tires are hitting the inside of the wheel wells. I currently don't run any bumpstops but I was wondering how others resolved the issue. I'm running h1s with 3.75" backspacing. With a spacer or less backspacing the tires will hit on the outside of the fenders. I would like to keep the wheel wells and the back seat for now. Somebody give me some options.