(Car Appearance)
| No. | Car | Entrant | Sponsors | Tyres | Body | Engine |
| 2 | GC21 Toyota | | KYOEI GROUP | Bridgestone | open | mid |
| 10 | GC21 Toyota | Team I Line | I Line | Bridgestone | open | mid |
| 18 | GC21 Toyota | | Dixcel | Bridgestone | open | mid |
| 27 | GC21 Toyota | MYG | | Bridgestone | open | mid |
| 62 | GC21 Toyota | MYG | MYG | Bridgestone | open | mid |
| 72 | GC21 Toyota | | WAKO'S | Bridgestone | open | mid |
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