ERR7408 stud, I could not quickly find the thread, and it seems that part number may have been updated as well, listed as stud for knock sensor to block. May be quicker to take nut off of other side for shopping.

 

I think my best bet is a junk yard. Pretty sure it's two sizes. The guy I got it from changed the engine and decided to put the knock sensor on the front driver side instead of between the cylinders.

Have a wicked knock and can't figure out why.

Thanks for letting me hijack the thread!

 

yanked one and since I don't have a lathe I wouldn't have ever been able to get this at the hardware store. Thanks for all the info guys