Note that use of the HRC springs require both inner and outer spring seats, along with the retainers.
So be prepared to drop over $600 on valve train items.
Also note that HRC is discontinuing these parts.
On another site, someone had ordered the same items... and then got word suddenly that the inner & outer spring seats were cancelled! Eep.
RSC is checking availability for me on all the parts I need... hope it is good news.
Ordered mine immediately when I read they were being discontinued.
Just got mine in today. Springs and inner & outer spring seats.
These will go with the custom Ti retainers I bought earlier.
Ordered them on the 13th and got them today. Excellent service!!