4runnerfox

Hey guys,
I have a 2001 4runner Sr5 sport edition. It had come stock with 16" inch wheels and brack rotors to match. I recently bought black American Racing wheels that happen to be 15". They didnt fit on the front when i first tried. so i replaced the 16" rotors with 15" ones to match..but yet again the fronts wont budge and go on.
I was told by a friend they made a type of spacer to correct this problem or something like it. I have searched and searched and found nothing.
The question is what should i do to fix this so i can run my 15" wheels? Whether there is a spacer or is a different alternative.

The other question. I need a new front right axle. How much would it be to get one salvaged and then installed? just ballpark would be great..

Thanks,
Zach