99 cbr900 I assume it's the bottom one since there is only one bolt on the ride side of the bike and the bottom of the left side lines up with it. Here is a pic below of the left side just in case you need to see (which i doubt). I was a little confused cause I saw this site and it says to remove the upper bolt:
Frame Sliders Install How-To @ ::[ SportbikeGuy.com ]::


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by the way what is the pinch bolt that is referred to for the engine mount bolts. Thanks