Engine Mount Transmission brace brackets

[elorenzof]

Hello gents, Im working on replacing an engine on a 76 K10. the engine mounts both have a bracket that are transmission brace brackets. However there are no brace rods connected to the brackets. (dont know what they are actually called) can i get these somewhere? Is it important to have this set up completed? its a stock th350 trans. Also, If i can find them, where do they mount to on the transmission? Please see attached image (image of brackets found on ebay not my pic but this is the brackets)