Scaffolding parts that are prefab only

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Trying to make a taller version of the scaffolding prefab and realized they have piece I can't use. It has curved supports to attach to the straight ones on another piece, so it can stick out from that main base. (is this making sense?)

 

Here's a picture to show you what I mean:

 

http://i.imgur.com/4EQzo8O.jpg

 

 

I'd LOVE to be able to have a piece like this! (preferably the small square, the rectangle, and the large square, with both longer and shorter supports).

 

If someone could mod this that would be amazing!

 

 

Thanks for reading.