There are several new or "like new" Chevrolet king pin bushing reamers on Ebay today, some at ridiculously low prices. Check them out, and you just might find one that's the right diameter. It's also really easy to make a guide pilot for an adjustable hand reamer.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!