Remove the upper assembly from the shifter base. You can leave all of the hardware in place.

The SH Spring is considerably taller than the H Spring. This is an easy way to tell them apart at a glance. You can also compress them in your hand to feel the difference.

Install the new spring on the shifter base.

Be sure to align the spring groove at the 12 o'clock position. This groove should not be on the sides. Do not install the spring in any position other than shown in the image.