Trucks identification help


Lester Breuer
 

I am attaching a photo of two Dennis Storzek kits I still have in inventory to build, one with trucks in kit  (box on top) and one without (box on bottom).   The Andrews trucks, plastic or delerin ???, light tan in color had to be assembled and the truck springs put in spring assembly area ( a real pain as not easy).   My question is who manufactured these trucks and out of what material?  And, did these become Accurail trucks?   
Thank You for your time and effort to help.
Lester Breuer

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