If it helps anyone in the future, its ⅜" holes on 2¼" centers.ive got a chunk of flat stock in the garage I had used to align the cams one my old escort at one point, it was brought up to do but I was determined with the rental. im fairly stubborn. though that probably would have worked better. in my head I figured taking the time to get the bar, measure the holes out, drill them.. id have to go down in the basement and get more tools out then put them back... bah. majority of vehicle tools are outside, drills, measuring tools and bits are in the basement.