just trial and error then i suppose, On a side note another thing thats bothering me, The way my strust brace connects is weired, I have 2 bolts coming up from my suspension through the strut top which go through the brace, the other 2 bolts dont come from the strut top. They are shorter bolts which are on a risen plate which looks like its attached to the strut top. The brace can only be tightend down to the this plate rather then the strut top itself if that makes sense?