I will add to what Andy said. I had an aluminum rocker arm failure a number of years ago and ended up buying a used set of Isky's that I sent to RAS, now Rocker Arms Unlimited, to have them bushed, restored, etc. I've run them for years without issue. I just recently bought another set of Isky's, just to have them. Once I receive them, I will be sending them to Rocker Arms Unlimited, to have them bushed, etc.

I was just on Rocker Arms Unlimited's site the other day and they still show their new rockers for sale, the ones that Andy mentioned. Might be worth giving them a call.