Search using way covers,quite a few out there.
My Mat. is missing the metal sliding covers on the Z(its a vert.) but still has the bellows type cover, I bought rubber shop aprons and mounted it over the billows, flat rubber,thin, can be bought from McMasters,it isnt perfect,but I am not either.
My Lagun has a window shade type rollup deal, I replaced the fabric,again from McMasters.