The adapters fit just fine. I just think the original Nuna PIPA (like before the Light and Lux, etc) isn't a great fit. It took my husband and I a really long time to get the car seat off once it was on, like 30 minutes and that was after we watched a bunch of YouTubes. I can almost guarantee I'd never be able to do it on my own while out and about. I'll probably just put the baby in the real stroller seat if I need to roll both the kiddos around. I'm going to keep the adapters just because it isn't a bad idea to have them around but I wouldn't recommend this for people with the original Nuna PIPA style car seat. The stroller rules, the car seat rules, just not together. On a positive note, Strolleria was the only place that had them in stock so, yay!