Mine not only fit in the 15" rim but with the smaller Willwood caliper (same size piston) and thinner rotor I am able to move the rotor to the other side of the top (getting it further in giving me about a 1" deeper mount) and remove the spacer all together. I am using group5 wheels though. I will need to make a new brake caliper mount but that's not a big deal.
I will post some in another thread when I get a chance. I maybe hijacking his thread here a bit.
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