carver fuse holder

Hi everyone, myself and my husband purchased a caravan last Sept. Unfortunately when the weather got colder we went to place the electric heating on and found the part that holds the fuse in the carver box is missing.the caravan is 17 years old and the caravan place ee purchased it from say they can't get another part.does anyone know of anywhere we could contact to purchase one.we were thinking 8f maybe caravans that have been scrapped due to age or accident but the carver electric box still intact.it seems a shame to pay for gas and also electric is safer.help pleade take pity on too older novices.thanks bob and kathryn Glen