Here ya Go
There listed as a Isky Spring, they are a PSI pac style spring. I ran a set on a 557" Wedge with .800 gross lift turning 7000-7400 rpms for about 3 seasons, and they still tested great. The retainers are about $80-$100 cheaper than the equal Comp Cams too..Im getting ready to get another set for the Hemi which has a .780 lift cam... They need a 1.95+ installed height to work with your cam though.
They are a 1.625 spring though, which IMO is minimal for a roller spring.
Looky and under $300
http://www.summitracing.com/parts/ISK-DR1224/