Right, i've come across both, now i cant 100% remember the order, but im certain the ones without the ring are from 1.3/1.4/1.6 CVH, and the ones with the ring i have seen on a 1.8 CVH, to be honest, if you compare the two there is no difference in the rockers, i think its probably just a different press or something, all that hole does is allow oil flow and its only where it touches the valve anyway. Shouldn't make a difference, i'm noticing the ones with the ring have come out of what would be appear to be a very abused engine however.......