I know cervinis makes a fiberglass hatch, and its probably the best one on the market.  Try sending them an email asking if it can be locked. 
		
	
		
		
		
		
		
		
			
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				-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
 
-1994 Ranger w/ 427cid windsor (daily beater)
 check it out!
			 
		
		
		
		
		
		
	
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