Anyone know a part number for the 4 exhaust manifold studs? I am getting a leak on the driver's side and I think also on the pass. side from my X-pipe. I used the gasket on the pass. side and can't feel or see a leak over there, but on the driver's side I can feel a leak and it's as tight as it will go. The stock bolts have shoulders on them that won't let it tighten any more. I'm looking for a part number for the bolts that don't have shoulders please. Anyone?