1 - you need to determine how long the difference is from the tip to the pulla hole.
2 - once you have worked that out and allowed for a connector/dacron for the tip end and a bead/knot at the pulla end you will know exactly how much you need to do a single top kit.
3m usually doesn't do two top kits unless they are 1.45m from tip to pulla hole and that might be a bit too pingy. And that's why most people buy the non branded elastics at 2m lengths like Chefster and many others.
2 - once you have worked that out and allowed for a connector/dacron for the tip end and a bead/knot at the pulla end you will know exactly how much you need to do a single top kit.
3m usually doesn't do two top kits unless they are 1.45m from tip to pulla hole and that might be a bit too pingy. And that's why most people buy the non branded elastics at 2m lengths like Chefster and many others.