I decided to compile some Kamen Rider Kivara pics. For those who don't know, Natsumi Hikari transforms into Kamen Rider Kivara with Kivara (Kivat-bat the 3rd's younger sister) in the film: Kamen Rider × Kamen Rider Double & Decade: Movie Wars 2010.
There is no action figure, there is no Kivara buckle, but Kivara does appear in the S.I.C. Kamen Rider Decade Complete Form.
Close-up of it: