That's a nice little add on / replacement pcb. There are not many things worse than designing a pcb then finding out that a component is no longer available.
I have had this happen to me before, I was told by the supplier at the time they had thousands in stock, then when i went to order the part I was told they only had 10 left and they were obsolete.
fortunately the company that was making the boards for me had a hiccup with the order that was in front of mine and were running 2 days behind so i had time to edit the pcb layout for a replacement component.
