Child convertible car seats that fit in a 2006 PT

[lsfcdf]

Does anyone have any information or suggestions as to a good child convertible RF/FF car seat that will fit in a 2006 PT Cruiser? We recently purchased an Alpha Omega seat and it's horrible! It's too big, does not fit, will not latch properly so we are going to have to take it back. I'm wondering if anyone knows of a good safe seat (preferrable one that is 3/1 - infant, toddler and child) that will fit and secure properly.