yea, I thought the ka ones were steel too. The retainers in my s14 head look completely different than these. The sleve were the cam shaft sits and the brackets that bolt the cam shafts down are all tore up, so the head is usless but the parts are what im cursious about. I cannot find OEm retainers anywhere online with a pic, or any information on weather or not they have diffrent designs. Also, I cannot get a close up of ferra or bc retainers or other aftermarket companys, so Im really in the WTF area on these.