The Wilwwod 170-0636 hat is listed on their website and Summit Racing with a 2.1" offset?
http://www.wilwood.com/Hats/HatList.aspx
Coleman make and 8x7.62 hat in varying offsets and charge an extra $15 for custom stud spacing.
http://www.colemanracing.com/R...-Aluminum-P4494.aspx
Larry Stock also has hats for outboard rotors from Sierra Racing, he ordered blanks and machined them for the 4 on 4.5 bolt spacing. BTW Sierra racing Products was purchased by Joes Racing Products who then promptly dropped making brakes.
Remember that in upgrading the brakes many go with a thicker vented rotor, which in turn alters the offset required. Custom caliper spacers are not hard to fabricate and come with many of the vendor supplied kits to correct offset. Another reason many choose the vendor route is it's all (supposedly) worked out and a bolt on, but so many wheel combinations and offsets in use that is hard to guarantee.
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