Hi, will this fit an older model Uppababy V2 plus rumble seat?

Hi Soniya, I don’t believe it would it. However, J.L. Childress have a compatibility guide on their website and if your car seat isn’t on the list, you can email them and they will get back to you. Here’s a link to it here: https://jlchildress.com/pages/compatibility-guide. Hope that helps,