Aluminum Roller Rockers questions

I have a set and they worked fine for years. I did have to clearance them to work on a "J" head with a 1.500" spring. I bought them directly from federal mogul in 98-99' when I worked for an auto parts company. Got them cheap. I bought a set of thick chromed shafts from Hensley and they worked great. They have the same I.D. as the other mopar aluminum rockers. I think that description is for the other rockers in that line like the chevy/ford stud type rockers. I didn't get to see how they wore over time I had little run time on them when hurricane Katrina hit and my 408" went under water. I do remember the only issue I had with them was one of the adjusting screws did break (but stayed together) but I called them and they sent me a new set free of charge because they said it was a known defect. I used them with a mechanical flat tappet cam so the spring pressure wasn't the issue.