Heavier springs for ZL 500

Hello again guys. So I found a universal fit seat for my AC ZL500. I know the springs are soft for just one person. So I'm looking for a set of heavier springs and I would think a set for a 2 up Pantera would work. The number is 0704-944/5. Would these be good springs? Keep in mind this sled will only be a 2 person one for one weekend a year. The rest of the time it will only see 1 person.

If you have any other spring options please let me know.

Thanks!

Heavier springs for ZL 500