i found these a while back but now i can't find them Who makes these? ...they are bushings that help line up the exhaust header on the head...i guess the bushings are smaller and fit the bolt better to help line the header up...thanks Bob
I used the brass bushings for the door hinge pins. You can buy just the bushings. I found them on the HELP rack at my local parts store. Worked great for me!
And I think Pete Tomka sells what you are looking for.