JDCFH

Hello, Have just bought a 2000 plate 2.3 Zetec Galaxy. On the drivers side the internal door sill made of light coloured textured plastic is missing what looks like a screw cap. Just wondering if anyone knows what part I'm on about and where I can get one from? They are square one end and rounded at other and are on the plastic part next to the for well carpet their is 2 on each side I think. Thanks Dan