Later model fox's got the rear floor pan reinforcements, and also had slight remissions to the strut towers and K-member
Re: Sub box. Try removing the spare tire and then angling the box into the trunk. Once it?s in replace the spare tire.
\'94 Cobra #4963/5009, black on black, not quite stock
Formerly owned a black '00 SVT, #1972
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RIP - Ray "Old Fart Emeritus" McNairy