Using mixed list item heights in different lists

I am trying to create user interface in list item heights need to be different for different uses of lists. For example, I’d like the list item height in a left side menu (the menu items) to be different that the list item height of a list shown in the side menu content area (the main view). i.e.

side menu list | content area list
item height = 16px | item height = 12 px
item height = 16px | item height = 12 px

I only see one height variable in the sass templates. Does someone have a recipe to have multiple class variations of item height. It would be best if I could define the various height styles in the sass variables. I’d like to do similar variations for text inputs – not just list items.