Battery post.

[JP-12]

I was told I needed to buy battery posts if I were to get an xs battery for my car is that just these?

http://4xspower.com/shop/terminals/580/

And what do I need to measure to determine if I need the 580's, 575's, or 586's?

[Nathan @ XSpower]

Just use the application guide on the top right hand side of the website http://4xspower.com/

If it doesn't give you the direct fit then call 888.497.4693 and we will tell you the best for your application.

[JP-12]

Yeah I gave em a call and was given a couple choices (D975 and D4700). I just bought the 586 post hopin they fit, they were one of the recommended accessories .