Dennis, Fred's set is all original, post car, pullman and luggage van. So now you know what to look for....
I looked on ebay in France and there is a set of rods but they are not the right ones, they are, as you have seen, for a smaller model and will not be usefull on your loco. In my spare parts i have a set of rods, the ones connecting the two wheels on each side. i don't have the external ones. I have only one spare boggie complete with wheels and i must have the missing tender boggies complete. i certainly have all the original screws to fix everything. i think that this one is a single pick up model so no missing part there.
I will look more seriously for the other parts next week end if you can wait a little... Price for the parts is nothing, i will not use them so they will be yours for free.
If your seller agree to send me the engine it is not a problem for me to send it to you with all the spare parts i have, it will save on shipping. My email is in my profile.