According to their website,
http://www.wilwood.com/BrakeKits/Pages/05/index.asp it may fit alot of 13" wheels. If you're interested in this kit, give Frank at Group Purchase, it's a link on the left a call as he's got an awesome deal right now. I just ordered the same kit. Here's a link to a post he had about the kit
https://lateral-g.net/forums/showthread.php4?t=13456
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Mike
Pro Touring 68 Acadian(Nova)
Speedtech subframe with high clearance control arms
Prodigy Bar rear suspension
Ridetech single adjustable coilovers
Wilwood 12.2" brakes
New Gen Splitters
LS3 and TKO600
Link to my build:
https://lateral-g.net/forums/showthread.php4?t=14349