I think this will work.  http://cgi.ebay.com/ebaymotors/2003-CHEVY-...1QQcmdZViewItem  
http://cgi.ebay.com/ebaymotors/2003-CHEVY-...1QQcmdZViewItem
The truck and f-body seem to be the same, but the truck doesn't have that big EGR boss on the passenger side.
				
			 
			
		 
			
                        	
		        
			
			2006 Superior Blue Trailblazer SS AWD,  Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
 
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning