Mines made the double clunk sound for years.
I do this.
I live on a dead end, so drive to the top of the road, reverse full lock right, then forward full lock left, pull up outside the house, apply brakes, clunk clunk.
I've rebuilt the brakes, new guide pins, the lot. No difference, so it's not them. Not the suspension, it's a bit worn but no clunks. Next I'm replacing the large rear bushes on the front swing arms. If that doesn't sort it I'm guessing it's the front swing arm front bushes that are moving slightly to resettle after full lock is applied. But that's easier to replace the whole arms, which will be a garage job as my torque wrench won't tighten them enough.
Mike