Omega B – Limo – Need information about rear axle bearings.

Since my Omi has been giving bad polter noises from the rear axle for a few days now, it is now clear; the elephant feet must be new. Dto. also the shock absorbers. As far as everything is clear, now my question, it makes sense to exchange the rubber-metal composite bearings in the triangle handlebar as well as the stabilizers of the rear axle equally with it? If yes, how big is the effort with the triangle handlebars? Stabilagers are, I think, no problem, Stößis either. Have only found posts here about elephant feet. Stößis are probably Bilstein B 4 or KYB, rubber bearing either Meyle or Lemförder. Second question about springs. The springs are installed with rubber bearings or rubber discs. Are there different strengths with Opel with these parts. At the Daimler W 126 the things were from 05 cm to 2.0 or even 2.5 cm thick. Have found in the Ecat so right nothing. Thanks in advance for sound feedback.