Slimline is no longer available, we recommend Iconic as the best option though Classic C2000 has the same looks as Slimline without being so slim.
Part number of cover only for Slimline, SC2000 architrave plate is:
SC2001C - Switch covers only for Slimline, SC2000, 1 gang architrave plate.
SC2002C - Switch covers only for Slimline, SC2000, 2 gang architrave plate.
For further information, please visit
https://www.clipsal.com/Trade/Products/ProductDetail?catno=SC2001C
https://www.clipsal.com/Trade/Products/ProductDetail?catno=SC2002C