John -
it took me four years to find all the parts you mentioned and many more to get my Pantera back to the original condition. I also needed the radiator, the fans, the standard steel coolant tubing etc. etc. up to the Goodyear Arrivas. Against the background of the time and money I needed to spend I would keep the parts. I use to keep all parts I took off of the car anyway to be able to document the history of it so even broken and therefore useless parts are on the shelf. However - if you want to make your Pantera purchase more reasonable and collect money for future repairs you may make a Pantera enthusiast, as "freaky" as I am , very happy with your original parts.
All the best,
Robert