honestly I don't have that information anymore. I made two that were identical, but I looked in my notes and don't have the info for the angles. To guess, I'd say 120 degrees?
take a protractor and look at the 90 degree angle, then offset the angle to 110-120, you can then see the typical angle a chopper would be, my guess is 115 degrees, anything less will make the turning of the bike too jerky and uncomfortable.