Need help with extensions


So my buddy gave me some swingarm extensions but no extended brake bar. Some of the brake bars on eBay don't show length, how do I decide what I need with an adjustable 4-8 extension?

Thanks in advance
Are you sure you need a brake bar? I didn't need one with my extensions because the hanger was designed to keep the caliper stationary. My extensions came from Roaring Toyz.

Yeah it doesnt hold the caliper, wish it did! But thanks for the input, I'm goin to give Ballz a call.
That or all things chrome sell a little thingy that hold the square part of the caliper hanger and has a round part that goes in the slot to stop it from spinning all while being un seen..

kool little part!!

ps.I also have one like link listed for sale $25 shipped!!!