Ed, the 6100 pictured has 6-lug Budd's...
Check the wheels, they might be 22.5" tubeless which is better than the 20" tube type.
Also, check the engine...it should be a 261. The 235 was not factory installed in the 6000 series trucks.
Make sure you look both of the trucks over very carefully, they have both been repainted and that can hide lots of bad stuff. The TF trucks love to rust above the windshield (inside and out), front and rear cab corners, door bottoms and the cowl air plenums (stick your head in the wheel opening and look back towards the door).
Mike B
