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  1. Vintage Mustang Forum
    My 1969 428 Mach 1 seems to have factory staggered rear shocks. It has rubber plugs in the two (standard) access holes in the floor pan where you access the top shock mount. Those holes are 2" x 3.5". The third hole, for the offset shock, is 2"x3". so the rubber plug for the standard hole is...
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