Your concern about uni lug mounting is legitimate. Do yourself a favor and buy wheels drilled with the dedicated bolt pattern that fits your car, especially if they are not hub centric. My GTX had ET vari-fit 5 spokes on it when I bought it back in 1982, the oversized washers on the lug nuts deformed easily and the lugs would not stay tight. I lost 2 one night during a high speed rip down the highway, the remaining nuts were all loose. I had just checked them a week prior when I serviced the rear brakes. No joke, if the wheel had come off I probably wouldn’t be alive today…