If you have a measure and a look at the link or give them a ring I'm sure they'll be able to help at a good price.
www.holden.co.uk/displayProducts.asp?sg=2&pgCode=040&sgName=Hardware&pgName=Washers+%26+Wipers&agCode=0718&agName=Wiper+Arms+for+Splined+Shafts
