For 156, 147, GT and GTV wishbones ONLY use TRW, they are the OEM and they are the only ones which come lubricated, I have given up fitting any other make now as I have no confidence in the reliability of other brands after an overwhelming failure rate , I have yet to replace a TRW arm less that 5 years old.
as for the rest of the car, ALL of these cars can have a slight rust issue under the floor, but mainly it's just surface, the GTV though will rot out the rear arches so look out for that, and they all suffer from corroded brake lines, GTV normally across the rear axle area but all of them under the front inner wing.