A question and an ask SBM 318

Thank you to everybody who replied. I need one plug that's 19/32" for the front. I already have one of these, only need a second one, and one that's 9/16" for the oil gallery up above the rear main cap. I am going to try Napa and see what they have first. My machinest is going to see what he has in the brass 1&5/8" plugs. I will keep everybody informed.