Cavalier cs-142e

i just bought a cavalier cs-142e machine which, from what i can tell, is a later model css-142 or very similar.. does anyone know anything about either of these two models and the best place to find some parts?  my main concern is fixing/replacing the door liner.. it is all sorts of cracked around each and every screw hole.. i really have no way to put it back up.. where could i get a replacement?  how much should one cost?

thanks for any info..