From a press release issued by the FIM:

Superbike & Supersport World Championships
Sugo – JPN: Wild-card riders

The wild-card riders who will race in the Superbike World Championship round scheduled on the circuit of Sugo on April 21 next, are the following:

Start number, Rider, Team

42, Makoto Tamada (JPN-Honda), Team Cabin Honda
43, Wataru Yoshikawa (JPN-Yamaha), YSP Racing & Presto
45, Takeshi Tsujimura (JPN-Yamaha), YSP Racing & Presto
47, Kenichiro Nakamura (JPN-Honda), Blue Helmet MSC
48, Yuichi Takeda (JPN-Honda), Sakurai Honda
49, Akira Yanagawa (JPN-Kawasaki), Kawasaki Racing Team

– A compulsory briefing will be held for all riders who will be participating for the first time in the current Championship, at 17h00 on the day preceding the day scheduled for the first practice session.