Indicator Stalks (screw vs clip in) when changed?

Hi,
looking to change the indicator stalks etc in the Micra, currently they are grey and degraded from the sun (didn't believe they were originally black!).
So looking to change and read some of the early ones had clip in as opposed to screw in stalks. Anyone know when this was changed (before I start wasting cash at the breakers), was there a date, or simply when they facelifted (ours is pre-facelift).
thanks.
 
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