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So I am running a 245/65/17 tire (29.5 diameter) on aftermarket rims that have a 5.5 inch backspace. The 235/60/18 has a diameter of 29.1. It appears that you are running Lexus rims which will have a backspace of about 5.6 to 5.75 inches. You have 3 options to improve clearance. First you can run the wheel spacers. H@R makes an outstanding quality 1 inch wheel spacer that pushes your wheels out and helps with the sidewall clearance issues but not so much the issues with the rear lower spring perch. You can get a little crazy and blow the wheel out past the perch with thicker spacers but it may cause some wheel bearing issues and the look may not appeal to you. Second option: purchase new wheels with a back space of 4.75 inches. Then you wouldn't need to worry about any potential issues with a spacer and get the benefit of more sidewall clearance. Third do the highlander rear strut conversion. That would solve all your rear tire clearance issues. I do believe that Nathan at Northwoods performance would be willing to sell you the front strut spacers and front anti sway links separately. You may need to add a 1/4 inch spacer to the top of the rear Highlander strut setup depending on your specific needs. The picture below is a 255/70/17 tire on the rear of my 2013 Highlander. 31 inch tire. Notice the clearance. That would be the same strut setup on the rear of our Lexus RX.

sweet thread