Mine is a 40V 2001 S8 which has variable valve timing (& is 1" arms). The gruven parts web site has a calculator for various models. I'm guessing 2" is for the non S8 engine.
I did get an e-mail from them to check the distance when I had placed the order. Unlike me, check the gap as though they arms are in place and not appart if they have snapped. Doh!
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