Sorry, I don't know if they can provide those items but I would imagine they can. We usually buy them from MB though on older models. I would replace the seat frame/spring and the lower pad at least. If the layback is bad I would do it too. It will probably only need the pad.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician