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The ECM should prevent shifting into reverse when the car is moving forward. Not sure why you need a separate lockout?
I have a Hurst shifter on my '02 without any spring and I cannot shift into reverse when moving forward. But even when stopped, shifting into Reverse is not that easy. I have to push fairly hard to go past the 5-6 gate to get into Reverse.
The stock reverse lockout isn't truly a lockout. It has a high tension spring that can be overridden with enough force. This permits moving the car in case of a reverse lockout solenoid failure. Just think about being parked nose first toward a building and the lockout won't let you get into reverse, That is when the spring comes to the rescue.