[Roderick]

Well I just received a bag of 12 sill clips from Rimmers. I opted for buying them from them albeit twice as expensive as other suppliers, mainly because in their picture they had the ones with black bits on them – as were the original broken ones. However, out of the 12, only 5 have the black bits.
The black fitted ones are DDQ100460, the unfitted ones DDQ100461.

I'm presuming they will do the same job, but why the difference? What does the black bit do? Do I need to return them? At £30 it's a bit steep.
If I knew they don't need the black bit I could have saved £12+ from elsewhere. Should I worry?