Whilst the point DG makes may be correct, the corrosion on the existing ones doesn't make BG's suggestion viable, so my original ask still stands...
New or corroded, people have been rebushing Omega wishbones for decades
If the ball joint has a knuckle on the rear face, then these are sided whilst those with no knuckles are reversible. Either way drill the rivets, and swap out/rotate the ball joint.
Both Genuine and aftermarket ball joints include the bolts for refitting them.
Also worth noting that the rrp for genuine wishbones is almost £300