Its a pity the NDF550 has a different pin out. Fine if a new pcb was being developed but right now, doesn't suit the pcb with the original part. Seems like the Polish guy is the only one with readily available parts right now. And with Covid19, not easy to get. I also wonder how many more he may have available. Probably started with a reel of them.
I took a close look at my V2 pcb. It would be very difficult to fit these even with track cuts etc.
vk3pe
