Harley uses some Japanese (or other Pacific Rim) sourced parts that
WILL have 10mm heads on 6mm bolts.
WHAT? The all American made motorcycle? I'm shocked!

It goes both ways... Several months ago I needed to replace a bolt for the
seatbelt in my 1976 Rabbit. It's a German car, so I figured it was a metric
bolt. I tried every available metric thread pitch, but nothing fit right.
On a whim I tried a fine thread imperial bolt and it threaded in perfectly!

Anthony Watson
www.watsondiy.com
www.mountainsoftware.com