Outer Limits 4x4 Board

Anybody in the U.S. done a cleanout on their intake/egr and used something other than daihatsu plugs? Of course the easiest thing would be to use the factory plugs, but why go factory if you can[i]successfully[/i] fabricate . Anyhow, wondering if anyone had used short bolts or if anyone had a suggestion, U.S. or otherwise....