Trying to install my external amp and the bolts I thought I had for it aren't right. They are M6x1.0, but won't thread in. VIDA says it's an M6 bolt, but no thread pitch info. Any thoughts? All of my Volvo-related M6 bolts are 1.0 pitch. I hit a couple HW stores and only M6x1.0 can be found. The online Volvo sites say NLA.