If IQ has used those springs- I have not, mostly use Isky, h IQis the go to source to ask about that spring seat and what retainer to use
comp does not mfg springs so it has to be a white box spring form somewhere and there must be other solutions for cups and retainers
Jones has lightweight retainers but IDK if he has one for that spring
Dart19666 at crower would also be a good source
sorry _ I'm west coast
Thanks for posting IQ I do like dual springs and will learn something here
