Yes, the old part number for the PTR/LEATHERETTE (pair of leatherette cushions for Encore/Supra) changed:
From 19025-01 (old)
To 60425-01 (new)
Both have been discontinued by us, however you still may be able to special order the "new" one.
The main difference between the old and the new is that the new leatherettes have perforations in the padding making it more breathable.