Andrew,
The "clamp blocks" are 1" thick aluminum with 4 different half-circle radius cutouts on each of the 4 sides. There is one v-notch top clamp piece held with 2 alan screws for each of the four sided clamp blocks. I am describing them as i do not know if that could also be termed a universal tube support. Intuition says they are the older clamp blocks you are referring to.
Thank you,
Lefty