I'm posting these two machine for Richard Hall (he doesn't have email).  the '55 had engine overhaul and upgrade to electronic idle system in March '07 and the '68 had engine overhaul and new governor in April '06, I did the work on both of them.  Richard bought a diesel and says each of the machines have about a year to a year and a 1/2 of use on them. Richard has priced the '55 at $4500 and the '68 at $3000 
If interested please call Richard at 580-761-1568.

Thanks for looking
Mike