Hey there, has anyone tried to install isofix sockets of the rear sit?  I have a couple of kids(1 and 4), one of which is obsessed with the car and want to be driven on it all the time. At first I installed lap belts, seems it wasn't enough for car seats, then 3 point belts, still the seats wobbling up and down and side to side. I got an isofix kit from amazon - it would be good if it fit, turns out the rear back rest is too thick for it and I can't find any other types so I could install those. 

Does anyone have a good solution for kids car seats for the rear seat?