When it comes to wishbones on the 156 I have to say it is always safest to stick with the genuine Alfa parts. From experience there is a huge difference. ( I learned the hard way with a couple of cars) Also talking with TI Autos in Dublin (who service mine most of the time) after they changing many many cars over several years, it is really the only sensible option.
Definitely if you have to deal with rough roads etc. The replacement of bushes can result is difficulties unless it is very carefully carried out and then if your wishbone has already done 70k miles it is best to change and look forward to another 70K Some people swear by Powerflex etc but for the average person the above advice is best.
It really trashes a 156 to have flaky wishbones..
oh yeah complain to ebay about these guys...
Alfa Romeo 156 SW 1.6 LPG Custom, Alfa Romeo 146 1.4TS, Alfa Romeo 33 1.3