You have bought a complete wishbone and they come with a balljoint. This is a 172/182 part and you have to remove it and replace it with a V6 balljoint (I know, i've just done it). The V6 specific balljoints are another hundred quid each, on top of the £80-odd for the wishbone so thats £200 a side to get the right items. They are also sided so you need to order two different part numbers to make a pair.
Luckily I have a 172 that the spare balljoints were very useful for