Harland Sharp has adjustable roller rockers for 5.7L and 6.1L Hemis. They range in price from $1600.00 to $1800.00.
You can find them here:
http://www.harlandsharp.com/hemi.htm
That being said, who makes a solid roller for a 5.7L-6.1L Hemi?
Regards,
Joe Dokes