I just did a little shopping on ebay- - - -there are several sets of piloted expandable reamers available that would cost less than having a machine shop fit oversized bushings to a set of spindles, and you'd have the tooling available to salvage some of those worn ones. With a good long-handled tap wrench and a sturdy vise, reaming the holes oversize and keeping them aligned isn't a very challenging job. Then a smaller reamer is used to fit the kingpins to the replacement bushings.

For a really precision fit, the same mandrels I use on my Sunnen hone to fit piston pin bushings can be used for kingpin bushings.
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!