What I would like to know, is how "movers" could drop and loose the slide plate? Were they playing with the machine? Or did one of them steal it? I only ask this because that slide plate will not come off by itself, it has to removed by a human.
Mom3 has given you correct info on the slide plate, but I'll add this. Although they fit and work, the finish will not match the original. The replacements finish is more of a brushed silver plating rather than the shiny nickle plate the originals had.
Joe