Safety box Ford Escort Cabrio

Moin Schrauber ́s, just bought me a convertible , with a defective fuse box. Now a stupid question: Has someone changed the DIng before and if yes, where can one buy the best? Have looked once in the bay and seen one there for 65 Euro. Can one ever count what I have to observe??? Still I can undo the purchase, because the seller explained to me that he also starts again after changing the S.Kast. Engine did not run due to the defective Kast. Please briefly for advice!! Thanks Ronald