Ford Fiesta 1998 Car Radio Wiring Has Been Cut Help?

What wires are for what in a Ford Fiesta 1998 LX Deisel with regards to the ISO wiring for the cassette raido 3000 some previous owner has cut off the block.

The wires are

1. Thick Wire: Orange And Black Stripe
2. Thin Wire : Yellow And Black Stripe
3. Thin Wire: Blue And Black Strip
4. Thin Wire : Orange And Black Stripe
5. Thick Wire : Green And Black Stripe

Can someone help please.

dwilliams03@blueyonder.co.uk

Kind Regards Darrell