I would guess that at least in 69, the Camaro and Pontiac used different body mount bushings.   The originals from my car (69 Z) had "CHEVROLET" embossed on the side.   I can't imagine they would go to that trouble if they Firebird used the same bushing. 
 
But I have never torn down a 69 bird.
		 
		
		
		
		
		
		
			
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