Where to buy arch repair panels for E30 convertible?

[pac1982]

Anyone point me in the right direction for buying some rear arch repair panels for E30 convertible?

I have found some for a saloon and my body shop says they can make these fit but would rather start with the right item if possible

I believe the only difference is the lower sill section which is still good on the car so should I just go with saloon panels??

any advice or criticism welcomed looking to get it done in the next 6 weeks ready for the good weather