Kamen Rider Black RX - 1988/89
No larger size available
Design documents of Kamen Rider Amazon. (1974) I found these on google and i think they're worth sharing around. I love the monstrous suit designs.
KAMEN RIDER RYUGA by MoA07.deviantart.com
Kamen Rider Fourze
/Kamen Rider Kiva (Character)/#475732 - Zerochan
Upper Body reference for Death Metal Rough - Kamen Rider Kiva by ~reaper78 on deviantART