Do you remember the tire size you had on the 16x8 23 offset wheels?I stuck my Iphone up there with the camera lens end on the tire and that's what came out. I had 16x8 et23's on my car a few years ago and about 3mm of spacer was all that was needed. Being the cheap guy that I am, I went to Ace Hardware and bought 10 real thick 1/2" flat washers.