Please. We don't need people dead from using something like this. If you want 5-lugs, do a cheap lincoln rotor/ranger axle swap, or do the smart thing and go w/ bigger brakes. Those adapters are just asking for trouble.
this brings up a huge list of issues. i recently helped a guy replace 4 wheel studs on an 03 cobra because of a bolt on spacer. you have to check the bolt torque on the spacer to hub bolts way to often, they are going to push out which ever 5 lug wheels you want to run, and they are expensive.