Converting from 4" to 4.5" boltpattern

Just in case you are still interested, if you have 4 piston Kelsey hayes disc on the front, with a little machining, you can use mustang rotors for the 4 1/2" bolt pattern.

http://www.forabodiesonly.com/mopar/showthread.php?t=20544&highlight=large+bolt+pattern