I have a 1985 MB with 80k miles. I seem to have a bit of a thumping noise when slowly (~25mph) going over road bumps, or at a higher speeds with small road discontinuities. Replacing the the front shocks reduced about 50% of noise level. I guess is some of the rubber bushings are getting worn maybe for the torsion bar. It is not obvious just looking.

What would be the most likely rubber bushing to replace in the front end or places to be suspect?

Thanks