valve spring retainers

I agree totally and that's why I went ahead and bought the studs for mounting the Rocker rails and they ended up being too long or the holes in my head's were too shallow. anyways long story long - the nut wouldn't tighten down before it actually held the rails down and I had to add washer it was really no big deal but I can't see where it help me I mean they're really only held down by 15 pounds of pressure anyway?
Again that was a different story in a different case and in this case absolutely buy the retainers. But that's why I was always saying be a little wary you don't need to really buy everything every time.