You need 165MM speakers, I went with FLi.
(I would post a link to the ebay page but you need at least 15 posts first
Ebay item number: 250900392347)
You will those adapters to bring the speakers forward so that they sit against the cover, these dont exist for seat so you'll need to buy golf ones and remove a lip from it (I simply snapped them off with pliers, the
guide on here done it differently.
The holes from the adapters are also too slim so either buy screws with a smaller head or use a 11mm drill bit to widen them.
And you will need wire adapters so that its a straight plug in
Ebay item number: 151140751081
In doing this there is no need to rewire anything, or fiddle about with the tweeters. Semi plug and play