The adapter does what it should, but it does not work in combination with a Hartan Racer GT stroller and a Roman BABY-SAFE plus car seat! I had the "SHR" in the Romans child seat ignored, which probably is the successor of the BABY-SAFE plus. This is ultimately still work you need the adapter to adapter. And this one: Romans 2000006066 Adapter BABY-SAFE plus, BABY-SAFE plus II
Thus, so finally a Roman BABY-SAFE plus car seat fits on a Hartan Racer GT stroller. However, it is a total of almost 50 EUR (!) Poorer and a little plastic ...