I emailed Larry and axed him if he ever kitted the T-Bird II and got a quick reply...here it is, copied and pasted:
"Hello Steve. No, I only kitted the First Thunderbird."
Regardless, the RSM laser cut ribs would not be appropriate for the earlier T-Bird, because (at least), the tip ribs would be longer than the plans. Brodak will apparently sell a set of plans, a laser cut ribset, and perhaps also a complete wing kit for the early version.
To cover all bases, no, none are OTS legal, but both (actually all T-Birds are Classic legal. Four? Five? How about SIX?!!! The early upright with either exposed cylinder, "Speed Cowl", "Radial Cowl", and the Trike. And then, the '59 (RSM) and '60 (Veco kit and clones).