Hey there neighbor (I'm in Duluth, GA)! I did the very same thing and used the Metric versions and had to modify the throttle by grinding down the nubs and then some! Mine hung up and I had to go back and grind more because the "compression" of the throttle part that surrounds the handlebar mounting system that is where all the friction is.
I grinded more off...then made sure I had plenty of lubrication between the throttle and sleeve where all the friction was taking place.. and it worked like a charm! No more problems!