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					Originally Posted by JustJeff
					
				 
				Machine shop can tell you what thread and pitch they are 
			
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 You can measure them yourself, M12X1.25X25 = a bolt that is 12mm in diameter, has 1.25 mm per thread and is 25 mm long from the tip to the base of the head. Nuts only have the first two numbers (M12X1.25).
		  
		
		
		
		
		
		
			
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				1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
			 
		
		
		
		
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