[Rails] How to know which gem version to install (Rails 3.2)

I'm using Rails 3.2 and when I'm on github I'm not sure where I can find
the correct version to install for rails 3.2. I'm sure it's simple but I
can't figure it out. For example, Rails_Admin didn't put the css files
in the correct place and I think the reason was because of the incorrect
version.

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