If you have stock oiling I would do like Dwayne said and bolt them on. Mine is stock oiling with high volume pump and 1/2" pickup but all stock oiling other then that. I use roller tip Hughes rockers that are not needle bearings at the shaft and mine has been flawless with no problems at all in 7 years so far. I think with stock oiling you should be fine. Is it a good brand rocker as I have heard some bad stories on some of the cheaper shaft needle bearing rockers ? Good luck what ever you decide. Ron