I am working on my 97 tj and I have taken off the rear shocks. 2 bolts came right out, go figure the 2 hardest bolts wouldn't. I had to heat them and pull out with vice grips. Anyway does anyone know the size of these upper shock bolts on the rear? Sae or metric? they look like a 5/16-20 but ive never heard of such a bolt. I would like to convert theses over to stainless hardware. thanks for your time.