I originally ordered the regular 2N strap without the peak design compatible end-points and a few days later decided to convert it with this retrofit kit (a costly decision). Make no mistake, this is an expensive kit and you’re much better off ordering the PD version of the 2N strap to begin with. In total I spent $80+ for the strap and retrofit kit whereas the PD version 2N strap is only ~$50-$60. My fault of course.
The 2N strap I originally had was 48” and after conversion measured about 53” end to end (with peak design hardware). This was a good thing for me since the original 48” length felt shorter than I preferred. Install was pretty straightforward since the tuenne end-pieces are just a few screws. The hardest part of the conversion is installing the PD plastic anchors (not included) onto the retrofit kit since it is a tight fit. You definitely need needlenose pliers for that part. Overall I’m really happy with the end result and quality even though I could have saved myself $20 just buying the PD version to begin with.