Well, in the end I have disassembled the rearview mirror and made a brico manual of disassembly and revision of the entire electrical rearview mirror: Seat Toledo 1.9 TDI 105 hp. of the year 2006 Motor Bxe.
As the Russian -style disassembly (using pliers) I have not just convinced I have used my own Spanish style (threaded rod, washers and nuts.)
If
you are interested Rearvisors and others are different in each model and brand. In any case, it can help you if you have never demolished any.
To change the mirror it is very simple and I have not put too much information because there are many videos that are Standar for almost all brands and models and almost everyone disassembles the same.
The rest is more than the specific model of SEAT.
If you don't work well, let me know to correct the link.