Best additional seats for two children in a Promaster

What are some good seat options people have used in your conversion for 4 person travel? I have a 5 year old, so she needs a seat, but I am having trouble finding Dodge seats. Any good website recommendations? Dealers?

Looks like these guys have a decent write up on it From this it really looks like you could pick any seat you wanted.i

I haven’t seen many of these in the wild. A jump seat configuration might save a lot of space where the rear seat backs set against the backs of the front seats and face the opposite direction. Interested to see how this works out for you and what you come up with.