Thank you - I did not ignore your advice and did search ebay. I didn't have enough confidence that anything I found there would simply bolt on without modification (I may well be wrong) so was pursuing alternative paths first. A logical one would be to use the original type 4 speed and the original type shifter for the truck. Other than a slight difference in steering column (shift mounting point)and the transmission cover, I know of no other differences between the 3 and 4 speed equipped trucks, so I don't think I'd be in the same place as I am now. I have the three speed linkage and the original 3 speed non-OD transmission, so that also remains an option. 3 speed with OD was not a 58 option, so I was inquiring as to its model number as a third option.
