As above, they are awaiting production, we get this all the time with Merc parts in work where we're ordering obscure parts for the hearse / limo conversions that would not normally be stocked as spares, it can be several months to get trim parts in unusual colours and that is on current models.
In relation to parts being made obsolete, they will make any parts for as long as the demand is there for them, they will even re-make obsolete parts if they get enough requests for them.