Always post as much technical info when asking a question- example Lionel or other brand product number.
I think you mean this one 6-11207
http://www.lionel.com/products...duplex-5511-6-11207/
then you take that same product number, go over to support and look up the product part information- exploded diagrams, and other details.
https://www.lionelsupport.com/...-4-4-T-1-Duplex-5511
And yes, the different height stanchions are available for you to purchase from Lionel parts and support.