Hey All,

Super random question.  Right before we launched out 2003, C36, someone in my boatyard decided they needed a hex bolt more than I did, and removed the bolt holding the sheave to the sliding car itself.  I know it didn't back out because I was still blocked and had just inspected my rigging a couple days prior.  They were kind enough to leave the sheave lying on the deck right next to the car at least. 

I'm about an hour away from the boat at the moment, so before I make a couple trips to the hardware store, are these standard?  Would anyone happen to know dia/length/pitch?  I know it's a longshot but always amazed at the depth of knowledge on this site.

Thanks!