This is my list of known SUMMER castings that represent Japanese vehicles.

July 2 2016 - ​ if you think I've missed something, please let me know.

SUMMER 
ACURA 
9219 Acura NSX
HINO 
9619 Hino
HONDA 
9343 Honda Beat 
9348 1992-1995 Honda Civic 
1988 Honda CR-X 
9226 Honda CRX 
1988 Honda Prelude 
9315 Honda Prelude 
9316 Honda Prelude 
ISUZU 
S8025 Isuzu Elf Gasoline Truck 
S8026 Isuzu Elf Mixer 
S8027 Isuzu Elf Drink Transporter 
S8028 Isuzu Elf Refrigeration Truck 
S8029 Isuzu Elf Sanitation Truck 
9331 - Isuzu TXD23F Fire Engine 
LEXUS 
9320 Lexus SC400 
MAZDA 
S702 Mazda Cosmo 
9550 Mazda Cosmo 
9220 Mazda MX-5 Miata 
1993 Mazda RX-7 
8701F Mazda RX-7 
9346 1993 Mazda RX-7 
9221 Mazda RX-7 Convertible 
B1 Mazda RX-8 
SF-B1 Mazda RX-8 
NISSAN / DATSUN 
8706F Datsun 240Z 
S8562F Datsun 260Z 
9319 Datsun 280Z 
SF-8 Nissan 300ZX 
5119 Nissan 300ZX 
S8631 - Nissan 300ZX 
S8631(F) Nissan 300ZX 
9003 Nissan 300ZX 
919 Nissan 300ZX Twin Turbo (1990) 
9013 Nissan 300ZX Twin Turbo (1990) 
B2 Nissan 350Z 
SF-B2 Nissan 350Z 
9345 Nissan Mid-4 II 
9006 Nissan Skyline 
TOYOTA 
A2 Toyota Celica LB Turbo GR.5 
SF-A2 Toyota Celica LB Turbo GR.5 
S8001 TOYOTA CELICA LB TURBO GR.5 
S8563 - 1982 Toyota Celica Supra 
S8563F Toyota Celica Supra 
S687 - 1977 Toyota Crown 
Toyota Hiace Tow Truck 
9803 Toyota Hilux 
9326 Toyota MR-2 
9807 Toyota Previa 
9804 Toyota RAV 4 
9317- 1987-90 Toyota Supra 
S8289 - Toyota Van (pullback) see also: S8305 
S8305 - Toyota Van see also: S8289