The ‘horn’ is what Nokia term the Car Holder part no. HH-12. The ‘clip’ is what Nokia term the Mobile Holder – N770 part no. CR-81 and N800 part no. CR-86.

My assumption is that the arrangement for affixing the Mobile Holder to the Car Holder is common to both the CR-81 and CR-86.

To be on the safe side and to avoid the possibility of multiple packaging and posting it might not be a bad idea to swap the entire mounting kit. I am in the UK and overseas shipping (if need be) is not that cheap and best to avoid doing it more than once.

If requested, then I am happy to swap my kit, i.e. HH-12 + CR-81 + retaining screw for a HH-12 + CR-86 + retaining screw.

I have run the part numbers through Nokia Accessories search facility but came up blank.