Did anyone even answer your question? You asked where to buy spacers and bolts. Wheel Adapters, Wheel Spacers, Hub Rings, and much more! | Motorsport Technology
That's where I ordered spacer/adapters and tuner bolts. My bolts have a cone seat but don't look like either of the ones the guys posted. Tenzos require tuner bolts. It depends on your wheel as to what you need. I don't know what Stern requires, and neither does motorsport tech. They sent me the wong stuff 3x.... and I had to pay for shipping all 3 times. Their customer service sucks..their employees are polite just the way they do business sux. I finally got the right stuff after I spec'ed out what I needed from the White Knight website. Still had to cut my bolts to the correct length when I got them. It's better that way I guess anyway.