I have a 2000 Grand Prix GTP with 117k miles on it. I ordered a PLOG along with a new exhaust manifold gasket. What holds the EM to the head? Bolts? Studs? The ones currently on there look pretty worn out and I would like to replace them with new ones. I would also like to replace the bolts that connects the EM to the crossover pipe. Where can I find these? I've been looking online for awhile and can't seem to find a place that sells them. Please help!