The main wheels did indeed come off KC-135.
If you are talking about the 1/72 Italeri kit, True Detail's produced a set for the A-26K if you can still find them anywhere.
The rudder and tail cone are wrong in the kit as they represent a WW2/Korea aircraft, not the wider rudder used by the A-26K. Whirlybird Models make a replacement.
Depending accurate you want to be, there was a list going around online a while back as to the corrections to make the the kit a more accurate representation of the "Nimrod"
Si