I will always feel badly about the IE HD rockers. I found that Metric Mechanic had tested them and found them significantly stronger (40% maybe?) than OEM. So I bought a set and tested them, and ultimately and got them approved into the rules. I’m still running the same IE HD rockers from that test, but it’s clear that there were bad ones. I agree that IE did not handle that issue well.
Metric Mechanic has recently come out with fiercely strong all-steel rockers. Same weight as OEM, just no AL. The MM rockers are pricey compared to OEM, but not pricey compared to other aftermarket rockers. I’ve not been too successful lobbying for their inclusion tho.
Re. rear sway sizes.
No, there was no sway bar change involved in the rule change re. springs. The rule was 19mm for the rear prior, and remained 19mm thru the spring change. Later, at the Sebring Champs, a desire was expressed to allow smaller rear bars and the text of the 19mm rule was “reinterpreted” to allow it.