Can someone please advise the best current source of the plastic slide/clips which adjust the electric windows on the Xantia. Mine is a Series 2 and I bought a replacement (and a spare) from Sesuya(?) in Turkey nearly 2 years ago. The replacement has just broken and I want to get a couple of spares - for next time (and the time following that).

They're puny things - perhaps deliberately so - (giving PSA the benefit of the doubt) to provide a sacrificial function (to avoid damaging something else). Alternatively, they've been designed to ensure sales of spare parts and to keep service departments (and DIYers) in work.

Either way, breakage is inconvenient.