Thanks Kevin. Those only work with the newer mounts that have a notch in them.
I do have pre-1965 tapped mounts and cross-hatch knurled l-rods/L-arms on all. Swapped the tom mount for an eye bolt model with hex nut which is the one that takes the most abuse. I was looking for a way to avoid swapping out all 6 mounts for new. I have our old friend Mr Hose Clamp on everything which is fine for setting the heights but does nothing for positioning the swing of the spurs and rack tom.The ones with the notch look just like the old ones and I have no issue swapping those out. I would obviously keep the original and label it. If your mount is pre-1966 though you may have issue with the L-arm and the wing screw threading directly on to it. By mid 1965 or so the tom brackets switched over to the way they look now. Eventually the floor tom legs, L arms, gull wing spurs and bass mounted cymbal arms all changed from a pattern like this XXXX to a pattern like this ||||. The later pattern coupled with an eye bolt to grab the rod was much more stable. Those can sometimes move too so I typically use two washers and a hex bolt. I also do this with the bass drum mounted cymbal. Those never mover after that.