The 67 bracket is defiantly different to the rest as are the shape of the center bit of the shock tower from memory. When I was trying to get Astro boys 351 to clear the 65 shock towers with the pipes (JBA) on, I read the instructions and it said to use 66 or 68 on brackets, I thought I'd put my 67 ones on, and they would not fit the car with out modifying the bracket they hit the center brace, so I went and got some 68's at Mustang auto parts and they fitted straight up, they are different, 66 and 68 on are the same but 67 is different for a small block and from memory where they hit the car the shape of the shock tower must be different as well on the center where the mount bolts up. I believe a 68 will fit a 67 but a 67 only fits a 67 as it hits the center of the tower on the others.
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