Other cars with rear steer
Nissan 300ZX, Skyline, Micra
Honda Prelude SH
Mazda RX-7 (FC3S), MX-6
SAAB 9-3 (ReAxs Equipped)
2006 G35, M45
Rolls Royce Phantom
Several non-us cars (EDM, JDM, ROW cars)
Toyota Aristo (Lexus GS here I believe, not equipped so in US)
GM trucks (QuadraSteer)
And probably many others. Even the Focus's Control Blade suspension offers a bit of passive rear-steer.
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...