Let's just get this out of the way, both of these figures will be Tamashii Web store exclusives. Which mean, unless you live in Japan, you'll be paying quite a bit more for these two figures.
That aside-- look!-- it's Tackle in SH Figuarts form!!!
Both of these characters represent seminal moments in Kamen Rider history.
Kamen Rider Stronger was the first Rider to have a secondary, more powerful form. Of course, these days, most Riders upgrade over and over through the life-time of their series... And Electro Human Wave Tackle is the first female hero in the Kamen Rider series. (Later she was deemed to be a true Kamen Rider, making here the first female Rider.)
The television show-- Kamen Rider Stronger-- ran in 1975 and was the fifth show in the series.
Both will be released in October.