Well, Bill and me think that both, beltwheel and pulley, are looking not that bad.
The snubber bearings are rusty but I’m pretty sure this version is not any longer available.
Ball joint can be replaced but this task is in fact a bit tricky.
stridacanada.ca/product/strida- … nt-socket/
Again, you will not be able to order certain parts, some are out of stock since years.