Original - very rare.

Australia

Don't know where the air con compressor pump would be mounted of a Volvo D16 / Renault F8M engine.

Not impossible, but would have to be more of a DIY fitment.

You'd need most of the 360 stuff (very rare in UK, as MP says, Aus is a good bet) plus the bracketry and pump from a Clio/Megane type thing and custom hoses.

It is doable, but will be a lot of searching for parts.

AC is the project for next year if I 'll be still interested, because less parts in the car less trouble

This car is very rare in my country, but since I've had privilege to own it, I've spotted a few. In a month of time 3 mk 3 and two mk 1. This morning I saw a beige 5 door mk 1, maybe mk 2 it was in the opposite lane from me.

Hi mate.
The headlight wiper just screws onto the bottom of the headlight.
The wiper arm come out throuh the bumper and the wiper arm just screws onto the arm.
Cheers Mark.