The o-rings on the bolt and valve guide are 015 o-rings with a 9/16th inch diameter. The o-rings on the barrel and the back of the valve guide are 014 at ½ inch diameter.
I'm checking with them to see if the older sterlings have different sized orings. The specs listed above are for STP and Bronze for sure.
Last edited by Skipdogg; 08-07-2012 at 10:40 AM.