Anybody have the proper dimensions, Parker (or equivalent) part number, etc for the upper spark plug tube O-rings?

I could go out and pull one, but if someone has it and can let me know I would appreciate it.

I find the MP O-rings to be too big. John Arruzza states on his web site that he has the proper dimension o rings but there is no ability to buy them on the web site and there is no answer at his shop.

Thanks!