We supply some of these parts whilst a few manufacture vintage type parts themselves.Thomann (worldwide) - Guitar Parts (UK) - also carries out pickup rewinding.We cannot advise you how to restore or repair your old Höfner.We publish some wiring schematics on this website for vintage Höfners. If your guitar is not on the list then we do not have the schematic.
There are a number of independent companies that supply some parts that are suitable for vintage Höfner guitars.
This sound can be used to emulate those pop sounds of the 1960s or slightly overdriven in a modern rock band to provide a deep driving bass.
It is also commonly used today in studios for recording bass lines for dance music.
However it can be a big project and you need to be patient, do research, talk to others and be prepared to modify parts if necessary.
Guitars/Basses from the 1960s are generally easier to restore as many parts are available either using new items or vintage items. The exceptions are those guitars sold by Selmer in the UK which will (probably) have a number stamped into the back of the headstock and guitars sold by Van Wouw in the Netherlands.