Torsion Bar Upgrade for '65 Barracuda Formula S

As you seem to know, the one thing I was going to ask but forgot until now is if there is actually a difference between left and right in ride height or pounds per inch spring rate etc…. On the oval track springs.
Ie: do I need to order two from the drivers side etc, as I would if I used SS springs to avoid A - excessive ride height, and B - uneven height from side to side.
Thanks in advance for your reply.

The spring rate is the same, number of leafs is the same. The P4529414 is a 0 arch spring, the P4529415 is a +1” spring. If you want the car to sit level you need both springs to have the same part #.