Shocks, shocks and shocks again! I would suggest going for Koni FSD to really improve the ride.
You could do the lot in terms of wishbones - our head tech Chris fitted a complete full set on his 3 litre 156 even though most of the old ones were OK, the way it drove afterwards compared to before was just stunning. It was on 2.5 V6 Sportpack shocks & springs before and 2nd hand GTA shocks & springs afterwards.
Front has upper wishbone, lower wishbone, anti-roll bar link, anti-roll bar-to-body bush on each side. 70k is good innings for most of that lot to be fair. Best to replace the ARB-to-body bushes with Powerflex, they'll never fail again then.
In terms of the rear, the only stuff that actually seems to take any strain and wear out is the rear-most radius arm, the pin bush and the strut top mount. The front-most of the two radius arms doesn't ever wear out but sometimes gets bent by inconsiderate jacking. The trailing arm doesn't really wear out very much either.
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