i believe u need two driverside lupo gti wiper arms and aeroblades, ur looking at about £100-£110ish new. 2nd hand hand they tend to go anywhere between £50 -£75. By the way just realised my mates corrado has had the lupo wiper conversion done.
well maintained Vr6 will keep going, but as has been mentioned before u need to check history for chains being replaced and that is a more of a desired requirement for higher mileage cars
i believe there is at least two earth straps there one that should be attched to the bonnet hinge mounting on passenger side and one attched to the side of the head, also might be worth finding if it's a fault related to the coilpack