Rotors for Kelsey Hayes 4 Spot Brakes

I have a 67 Barracuda with Kelsey Hayes 4 spot front disk brakes. I want to go from 5x4" to 5x4.5" big bolt pattern (BBP) and was hoping that someone out there makes a replacement rotor that fits the Kelsey Hayes 4 spot caliper and has the BBP with 1/2" studs. Any ideas?

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