What measurements

Hey guys, I'm starting to look into the rims market, I wanna dump my old dog dishes and replace them with some nicer ones.

My question is which measurements do I need before I go rim shopping. Right now these are the ones I really like.
BOSS-304superfinish.jpg

(they're boss 304's this is the super finish)
304.jpg

(this is the chrome)

Everything is stock on my car (66)... The options on the boss website include lug pattern, and offset.
 

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