Stoonly What year model is the car, what plastic bits do you need to repair/replace, and what colour?
It's amazing how many changes were made in the plastic trim parts over the years, some of which do have subtle differences that nobody really notices until you put the two parts together side by side, so year model is important.
Many plastic bits are available as reproduction (e.g. via Voluparts) or NOS (via gcp.se). I've used superglue and Araldite on the non-visible side to repair some parts which are unobtanium, but have ordered new bits where available since most OZ cars have very well-baked plastic from the sun. The youngest used 240 parts are now 30+ years old, too… so, there's that.
A mixture of 50% boiled linseed oil to 50% metho is better than commercial protectants at cleaning up the plastics, but care must be taken to dispose of the soiled rags afterwards, which are quite volatile and can easily cause fires.
