The reason you haven't been getting responses, is that this forum has moved to a now location.  See the "New Forum" at the top of the page of this section.
To answer your question, it does look like you need a new cover.  The lifter will depend on the damage to lifter.  You can try to ask dealer, Ideal, or Jacuzzi, to discount a replacement.  If not, find a quality replacement from a different manufacturer.  I haven't priced one for awhile, but $350 to $400 used to get you a good one.