The T&D race rocker requires head work. The head has to be milled down on the top so that a common bar can be placed on it. The bar is held down by the head bolts/studs and individual paired rockers bolt to the common bar.
You can't buy individual T&D rockers that will work with any shaft and stand. Most of the T&D rockers have needle bearing fulcrums and do not use standard FE shafts.
Will you be doing a batch of adjustable rollers anytime soon Brent ?
Since I found out that POP offered their rockers with a cup adjuster up in the rocker body, I quit offering the special adjustable ones from HS.
With that being said, I’m direct with HS and can request about anything if someone wants it, but if I were going to that length, I would use Doug’s rockers first.