I didn't actually say you were wrong in the first place, so you can get off your high horse and stop being so blunt. I was just posting some info i found about it.
I'm not on my high horse. I know a fair bit about suspension. And I cant understand why anyone would want to pay for 4 wheel alignment on a mark 4
Ibiza. I asked Aimez as I know she has a MK4 and I wondered what would make her pay for something that just isnt possible on her car.
As for being blunt, I call a spade a spade, if you dont like it, dont read my posts.
The info you found is spot on. And I agree a 4 wheel alignment check (note the word check) is a great thing. Lets you know all parts of the chassis are straight etc.
But nothing more than a check can be done on MK4s without modifying parts. And its way overkill for what most people need.
For the OP, he certainly doesn;t 'Need' a 4 wheel alignment. Its a worthwhile check but since he didnt hit the rear wheel (and hasnt in the past - maybe) then he wouldnt need the check doing after replacing the wishbone.
What he would 'need' is a front wheel alignment done, which is done relative to the rears at any garage I've been in.
Thats not to say he wouldn't 'want' a 4 wheel alignment check done, for piece of mind.
A lot of people, after replacing the wishbone, would prefer to spend the £30ish they need rather than £100