Looking at the Wilwood site it appears that they are radial mount. With the 14" rotors they show 8.13" from center to the outside of the caliper. Was hoping to stay with 18" wheel so I need to look into that closer. Site says they "may" fit 18". I could live with smaller diameter rotors but doing that may make the deal untenable if I have to replace the discs.
https://www.wilwood.com/BrakeKits/BrakeKitsProdFront?itemno=140-12629-R