Recolouring of a new upholstery

We recommend the conductive seat renovation kit. The quantity will be more than sufficient, as your leather is new we will replace the repair paste free of charge with a larger quantity of varnish that will be used for maintenance. Concerning the pigment recolouring agent, it will hold all the better as your leather is new. You will have to destroy the original varnish by lightly sanding with the sandpaper provided), followed by cleaning with degreaser and stripper to remove the residues from the sanding. The aim is to open the pores of the leather for an penetrating fixation.

Thank you for your answer.
I will order you a colour chart as soon as I receive the vehicle because I have a little trouble distinguishing the available greys on the online colour chart.

Information taken, all the parts to be recoloured are made of PET (imitation leather), except on the steering wheel apparently (!).
Is it still possible to dye them permanently?

The durability is not a problem but the application of the product on a leatherette in a different color from the original is quite delicate except by spraying.