Hi Morgatto!
Technically, any of the 23" legs (they were advertised as 23") would not be "period correct" for 1967, as Ludwig was only offering the shorter 17" legs. However, you said you're a tall guy and the legs you're considering would be more appropriate anyway. The legs you pictured have the longer splined section and probably from the 80's or newer. I have a set of mid-to-late 70's 23" legs where the splined section is only half the length of those you are considering. I would definitely go with legs with the longers splined section. The shorter, and period-correct, legs won't give your tom enough height!
And, YES, those legs are Ludwig!
-Mark