where do you guys get your copper crush washers from, for the oil/coolant lines on the turbo/engine, etc.? I'd like to get them local if possible, but being metric not sure how feasible that will be and/or what sizes they are; suppose I could measure them, but wanted to see if there is a good place to get these. Don't really want to go to pep boys, etc., as they have big % markup, so would a hardware store carry these?