Which adapters to fit a Joie Gemm cat seat to a Joie Versatrax chassis, and where to get them?

Heya, Myleenie,

To fit the Joie Gemm car seat on the Versatrax, you need these adapters (it is the same adapter set that accepts Cybex/Maxi-Cosi car seats):

However, they are rather scarce these days. I suggest browsing Amazon, eBay (I saw multiple classifieds with these there, just search for Joie Versatrax adapters), classifieds of other sorts, or contacting the Joie customer service about availability in stores.