The "how" I found those.
Yes, I identified the wrong 8 wheel trucks in the parts breakdown. However, the key word search is "TENDER TRUCK / 8-WHEEL" to which I modified to "TENDER TRUCK / 6-WHEEL". Then I refined the search with "Railking" to remove all the premier listings. I then started from the bottom working my way up opening up each picture and looking for the key element that the pivot point had to be not centered over the middle axle, but instead moved slightly forward of the middle axle and thus nearer the coupler mount or drawbar mount. By shear luck, it wasn't too many up the list that I came across the rear one that might work, and since it was Forty-Niner I changed the refine search function to that to help more quickly find the matching front truck from that set.
I know searching for parts sometimes you just have to do that above method and it works for both Lionel and MTH parts sites respectively. You find a keyword string (example Tender Truck / 6-Wheel) and then pay around modifying it and a lot of looking at pictures but the method does work.
