Help needed with body panels

[Simp]

Can anyone help point me in a suitable direction?

I am looking for new sill panels for my dads marea weekend it's a 98 model and he's had it from new so is really attached!!
Any how I cannot find any panels anywhere ... My dealer tells me they are discontinued
Fiat part nos O/s 71712814 . N/s 71712815
Can anyone help??

Please..