steering clutch linkage bushings. 
 long story short my dad removed these bushings to have some new ones made and the machinist passed away in the process. not sure of the nomenclature on them, but thats the best i can come up with. any help with a part number or source for them would be greatly appreciated. also, if the ones from a D4 would work that would be awesome too. 

thanks 

He found two halves that are threaded and not sure if the other sides are or not. This is what I’m after and the short threaded rods too. Thanks

 
Try general gear, florin tractor or fellow member Bmr

Appreciate the help. It’s been a few years since he took it apart. I guess he has the reqd parts albeit worn out. Thanks again and will try what you suggested.

they are just a pin clevis with a threaded shank clevis yokes are readily available from engineering suppliers and a ht bolt could be weld on to get the threaded portion the fun bit would be getting a appropriate spring.

it also never hurts to try your cat dealer they still have listings for some parts especially if you have a parts book as they can search by part number some parts have superseded to new numbers as changes happened but the part will still fit. some parts are even still in use on later gear this is particularly so for fasteners.

The spring is available from Cat with that 5B2121 part number