Pot Rivits? water bottle filter cleaning Vectra 2004 Sri?

Phil you mentioned to push out the pot rivits, how and did you have a special tool to do so??

When you push out the centre of 2 of the plastic pop rivets they fall into the car frame and are lost. I found a 5mm rawlplug served just fine as a replacement and also left me something to pull the damn things out again. Ross K's the man! Good advice.