Kamen Rider SPIRITS by Ishinomori Shoutarou x Muraeda Ken'ichi, 16/16 volumes (+ Official Fanbook [RAW]). ENG scans by various groups, like the infamous-worst-named-group-in-history The Nevada Child Rapist among others. Never shared in entirety before. Haven't read this yet but apparently it's a pretty cool manga about shouwa era Riders. The story continues with Heisei era Riders in Shin Kamen Rider SPIRITS (26 volumes, ongoing) which I'm going to share sometime later, but those are all RAWs, the series is being translated though. Enjoy!