[Mart]

I bought an old school purpose made kingpin reamer and it works great. Before that I used a standard reamer but used to replace the bushings one at a time. Knock the worst one out, put new one in, ream it using the remaining old bush as a guide. Then do the other one using the first new one as a guide.

As you already have both bushings in place you either need to beg or borrow the proper long reamer or, as said, take it to a machine shop.

Mart.