Do they now..

yup. Hence why I'm no longer interested in the one on here, I'm just going to go get one from a mk4 with the wiring which suprisingly just plugs into the already existing loom. It's really that easy. I'm going to look into the heater boxes when I get a chance. When I put it in Ben's cab I used the whole mk4 heater matrix unit which fits straight in. I'm going to get another to see if it fits in the polo whilst it's all in bits.

I dunno how your polishing but I always bolt them to the car and let the engine do all the work. Much easier

haha got to try that!