Because I like factory stock for the most part. I want to get this thing back to a known good engineering perspective, and no aftermarket nor individual ever sent as much money on research and engineering as Ford did to make these things run properly, and this is way more than one rod or one link on these transmatic models, it is actually quite convoluted to get it right, I spent some time with my C600 to get everything back to factory stock after 40 years... and I have been rewarded with a 40+ year old truck that just starts, runs and works the way it was built to without any negative traits.
Besides, if I can just get the proper stuff to began with, it saves me time and long ago I lost the desire to work outside in the winter. At least work. Fun stuff like actually using the truck day to day without having to work on it is different and very enjoyable.... at least to me, others, and I can count myself in this bunch when I was younger get more of a kick out of working on things. Each to their own.
Age changes things, and now I understand why the old guys thought I was crazy to spend as much of my life and money working on stuff.
That said I now have in hand everything but the final rod that goes from the transmatic throttle bracket to the carb, that one it looks like I will be making. However since I have all of the rest of the factory rods with the proper lengths to get the geometry proper between the governor, the throttle pedal, the transmatic throttle bracket and its own linkage going down to the transmission, I feel pretty comfortable that I can come up a proper length home made rod. I do need to source a couple of ball joints still, hopefully I can use a 1/4"x28 threaded ball joints from a marine engine.
Still, if someone comes up that final rod, it will save me more than a few hours work by the time I drive around trying to find what I need and then fabricate. And I would be happy to pay good money for that this time of the year.