Whilst tub is off - rear suspension/axle

Just wondering whether it is worth replacing any 'difficult to replace' suspension/axle parts whilst the tub is off my Defender 90 (Chassis restoration project). I was thinking maybe top link bushes as these look well rusted in, and would be difficult once tub is back on - or do these never fail, and just go on and on?
Any other parts suggestions welcome,

Thanks in advance

definately do A frame bushes and fit new botls that secure brackets to chassis cross member 2 x m10 x 45mm and 1 m10 x 55mm per bracket