POWERPART C-Line Range. Bagged with Header card. 1 x C-Line 1 Way Face Plate DARK GREY CSM Range for use with PO298 Powerpart C-Line Surface Mount Back Box. C-Line is a modular range of wide range of electrical Components & Facias that mix and match to suit whatever your requirement you have.They are interchangeable with CBE Style Facias etc. Fitted in a wide range of Caravans & Motorhomes including Bailey, Elddis, Adria & Coachman.