I drove a 1962 190Db for around five years. I have driven a Porsche for the last 15. That probably sums up my feelings on the subject.
Parts are probably available from MB for mechanical. I doubt that they provide door seals anymore. The car was much harder to work on than later versions such as the 190/200Dc.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician