Last/end
Not quite, although this is well on the way. The polypropylene upper arm may have been a later replacement, or if it was OEM then they were phasing in the new arms, although it's odd to see the metal bottom arm.
This unit still has the porcelain/metal tank and traditional dispenser.
The last of the last were polypropylene, with PP wash arms, a "soil separator" (*does hand jerking motion*) underneath the bottom wash arm and above the pump intake, and a new door liner that was molded one-piece with a circular detergent cup that was totally different than the swing-out type shown. That door liner and cup was a vast improvement over the old one that tended to be fragile.