Update: I just got a shipment of one pad from my order of March 15. 3 weeks ago I asked about the status of the back ordered pads (3 at that time),
and was told they would be available in two weeks. The packing slip in my one pad delivery shows two pads of the same size, 33mm, still back ordered.
Ironically, that is the specific size I asked about 3 weeks ago when I was asking when I would receive my last three pads.
If you need a pad set quickly, based on this experience, you better be sure they have them in stock when you place your order.
I'll post further updates.