4th gen F body seats fit really well.  Front holes line up perfectly, rears can be cut & re-welded, or you could make a bracket.  I have used many sets of them in first gens, and its an easy swap
		 
		
		
		
		
		
		
			
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				69 RS LS3/T56 
68 firebird vert LS1/4L60E  
67 RS LS2/T56
			 
		
		
		
		
		
	
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