where would you be purchasing them? is there a link of some web page you can inject here? If they are like the KMJ roller rockers advertised on ebay then I would steer away from them. Very poor quality and fitment problems.
one of the Mopar brains here on FABO referred me to this link. I have followed it to a T. And I thank him for it.
http://www.compcams.com/information/Articles/Type/Chrysler/CC_MM0201-001.asp