Which infant car seat is compatible with the convoy dx stroller?
I don't think this stroller is compatible with a car seat to create a travel system, no. So - none.
Even if there was a dedicated car seat, it is an older model and you won't be able to find accessories to attach one. Older car seats also pose a hazard of not being safe, so even such a car seat would not be a good choice, even if there was some older model that could click on.