I have a 1990 NA volvo 240. I'm about to replace the header pipe and exhaust manifold gasket and I want to go ahead and order new studs for the manifold(the 8 that go into the head and the 3 that go into the manifold to hold the header. I read a thread on here saying the header bolts are m10x1.25 is that right? if so how long are they? The 8 are m8 x 1.25 x 45mm I'm pretty sure. I want to order stainless with hex head/allen ends.