On the road again,
I am not sure! Even before the tapered pin is inserted into the axle, the pin fit should be "very very snug"...a hard hand press fit.
If your spindle bores are actually worn, they wouldn't be worn concentric, so would need to be re-bored in a precise manner. This would lead me to believe there are no standard OD-plus bushings in a over the counter set.
There are lots of combinations of king pin sets with press fit bushings, floating bushings, spiral bushings etc. If this is actually kingpins, and not wheel bearings, I think you would need to disassemble your spindle/axle and make sure what exactly you have.
Re-boring and bushing the spindles would be cake walk for a machine shop....there might also be sets that DO have oversize 'OD' bushings, who knows!
Stuart
