The mirrors are Mk4.5 items from the Brazilian Golf, they used mk4 style doors with mk5 wing mirrors
They cost me £140ish and bolted straight on, wiring was also plug and play apart from the indicators but they were just piggybacked off the back of the hazard switch
The result


In answer to the condensation question, make sure you leave them outside to acclimatise before fitting them, bringing them straight out of the house and fitting them will create condensation. Also make sure the bulb holders are fitted properly and sealed