While the 70-81 springs are shorter, they're not any harder to install than regular springs.

Hood springs are very easy to install.

1) Hook the back end of the new spring around the rear of the hinge.
2) Take an old fan belt, hook it to the front of the spring eye. Pull towards you.
3) Hook the spring eye to front of the hinge.

All done!

Removing the hood springs is just as easy, using the fan belt method.