I need to make wheel spacers before I can mount my merkur 14" wheels. I think the bolt spacing is 108mm not sure if this is diameter or the size of the inscribed square? Bill D. ps: Merkur 14" wheel 41 mm offset, 95 Contour 47.5 mm offset for 14" Al rims.
The "108mm" refers to the diameter of a circle drawn through the center of each lug hole. This way, the measurement works no matter how many holes you have. Of course, on a 4-lug, you could measure corner-to-corner and get the same figure.