I know the k-member is square. Spent quite a bit of time with strings and plum bobs getting it within 1/16 of an inch. The IRS is dead nuts square too. The distance from the tires to the fenders are perfectly equal on both sides. The IRS either fits or it doesn't, there really isn't any room for error with it, so I would have known about any issues long ago. I'm not going to worry about anything until I get the fenders on the car and see what the tire offset looks like. Something just seems off to me. I may send Maximum Motorsports an email and get their opinion.