A quick update on the C63 wheels. Besides the 15mm spacers from H&R, I use 12mm x 1.5 40mm R13 lug bolts to fit both the seat on the wheels and the thread on the hubs. I got them from RAD USA

 

I also did this upgrade. I purchased the front bumper from eBay because Gary Suvneer said they no longer carried front bumpers but I bought the rear bumper and side skirts from them. I also added depo headlights. Here is the progress so far...