I'm looking to replace the internal 'latches' to the two habitation door catches. The type that has a latch (two in fact, one top and one bottom!) that 'grabs' a pin in the side of the door frame similar to that found on car doors often. They have worn internally and at the pins so we need to be slamming the door in order to close it tightly, does anyone know of a supplier of these kind of things please?