S4 big brakes - new wheels won't fit

[Lincoln Rutledge]

My friend upgraded his S4 brakes, he calls them Big Reds.  I'm sorry, I
don't much about them.  I believe it's a 2002 model.

Anyway he got some new 18" wheels, I believe off a newer car (A6
maybe?).  When we went to bolt them on, the face of the caliper hits the
inside of the spokes of the wheel.

Now he is thinking spacers.

Is that a good idea?

Does anyone have an idea how big they should be?

Will they make the tire hit the wheel well on the lip?

I can get more specifics.

Linc

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