So I have M8-1.25 x 90mm and 80mm bolts to relocate the knock sensor but the bolts are threaded all the way. Would I also be better off using 100mm and add washers and a nut? The it appears that the 90mm will not be making contact at the bottom. I'm working on it now so I'd appreciate it if anybody could answer and tell me why 90mm is ok to use it not.