Yes Monica, the plastic can be replaced. The trouble is getting parts. We have the same doors. Our plastic is ok but the nylon rollers that slide the door are shot. We have decided to scrap the whole unit. You can have the plastic if you want it. It is in good shape and is white with gold flakes in color. We have 4 pieces that are 57" x 13". They slide right down onto the frames. Contact us at firstname.lastname@example.org.
Good Luck, Joe