I had these done by bridge craft engineering.
Iirc these are an early 306/205 hub that were 16mm but the ball joint holes were not true, I had bridgecraft open the holes up to 18mm and then sleeve them back to a true 16mm ball joint hole!
I then had them blasted and powdercoated black, I then fitted brand new skf wheel bearings.
I then ordered new ball joints however I ordered 18mm instead of 16 and couldn't return them so I had another set of hubs done by bridgecraft and kept these as a spare.
To save a bit of money I attempted to remove the new wheel bearings and use them on my other set but whilst trying to remove one of the bearings it destroyed it so I gave up and got another set
In short I now have a pair of 16mm negative camber hubs, one has a brand new bearing the other is unserviceable
I have also managed to loose the top hat sleeves to turn them back into 16mm hubs, I have spoken to Allan and he is happy to make another pair of sleeves but will require the hubs to match the new sleeves
Bridgecraft charge £140 for negative camber hubs, the shot blasting and powdercoating cost me £60 and a further £50 for 1 wheel bearing
These are up for sale for £210 delivered ono, this includes me sending them to bridgecraft engineering, them making new sleeves and sending the lot to you