How did you examine your rockers?
These rockers are aluminum with a steel cup. Over time the cup will get forced into the rocker or fall out. Both have happened to my Rover. I purchased complete new rocker assemblies about 5 years ago for roughly $80 ea. Was quite a deal for genuine rockers, and since then the price has jumped over $300 ea.
Anyways, you can buy single rockers to replace the worn out ones, but I prefer to err on the side of caution. If the vehicle is a keeper, replace the whole rocker assembly.
I should mention that I also chose to replace all the push rods and all the lifters too.
The push rods were Rover brand and the lifters were a US mfg.
Best of luck!
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