[murphyv310]

Hi.
One thing I never do it to think the car "Stands me £££" Cars are a win or no win item. No matter how much you throw at them you never get that investment back unless it's a classic.
If you like the car fix the problems and enjoy the experience.
What you have fitted so far would be normal replacements, Tyres go on anything as you know, batteries can fail, modern ones probably are more prone to sudden failure than in days gone by, crank pulleys are again a common failure on many different engines.
Springs, discs and brake pipes are common issues on any older car, just look in garages bins!
If you don't want repairs buy a new Fiat on lease!