Hi I am looking for convertible car seat for my 2 month old. My choice narrow down to,

Maxi Cosi Pria 70
Maxi Cosi Vello65
Graco Size4Me

My car is Vios 2010. Any comment on the size of the carset can well fit into Vios. By the way, does the models above include for locking clip? If no where can I get it from.

Thanks