Put in 4 or so, no problems but they all have been boxed where yours was not, one big problem mentioned on another forum from a expert was that there is no 4000 Mustang II's, and we tend to put these on heavier cars than the original design which could be beefed up a little. With that being said and many using strutless lower a arms. and then the back spacer isn't supported and fatigues the integrity of the crossmember. The solution is to add a bracket and put the through bolt in double shear on the lower pivot. On my latest car I did this because the weight of the hemi I put in, made me feel a little better when I hit a large bump, the picture is off another site and nothing I have done but you can see the bracket going from the frame to the back of the bolt, pretty easy to do and extra safety. Best of Luck Matthyj
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