No one makes a pair port header here in the states for a decent price, it you wanna pay upwards of $500 there is a sticky at the top of this section with someone that custom builds them.

You can use the 2.0 header found on eBay.au but it will have to have the collector modified to fit the truck (any exhaust shop can do this) here is one going for cheap right now
http://m.ebay.com.au/itm/331490718574?nav=SEARCH