copper bar ratings HELP!

[SWFL 10+ year member]

Just wondering if anyone could lead me in the right direction as far as what class or copper ratings specs I need to look into for purchasing a pair of copper bars just to connect all my runs to the front battery.

Just need two pieces that are like 1" wide and 5" long and not sure how thick they should be. I have 2 runs of power and 2 runs of ground and a 250amp alt. Running a D9 along with batterys in the back. Roughly 5k watts.

Heres some I have been looking at whats the difference in the class and such.

http://cgi.ebay.com/Copper-Flat-Bar-250-x-1-25-x-12-Class-II_W0QQitemZ110375265047QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item19b2e0e317

http://cgi.ebay.com/Copper-Flat-Bar-750-x-1-25-x-36-Class-III_W0QQitemZ350188939357QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5188e3285d

http://cgi.ebay.com/5PIECS-C110-110-COPPER-FLAT-BUS-BAR-5-x-1-25-x-6-75_W0QQitemZ280403797220QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item41495e64e4

the prices on those are amazing i mean 1/2" thick x1.5" wide x 4ft long for 65 dollars is a hell of a price

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