I drilled the rotors to keep from having to spend money on a 5lug swap, plus the cost of rims. The rotors weren't redrilled in my back yard, I had a friend do it who works at a legitimate machine shop...so, I feel safe and confident.

Me not knowing about the part in question leaves me waiting to decide if I actually "need" the correct piece/parts. Now that I know, I know what needs to be done. Thanks.