Yeah, good luck with that! DMAC-04 are rare as hen's teeth!
What are you trying to achieve here? If you want to whack an A3640 into an A3000, you can usually get away with Kickstart 3.1 ROMs and page mode FastRAM. The DMAC-04 isn't essential.
Even if it is, I'd try a couple of other DMAC-02s first, or even consider a Zorro-based SCSI controller if your on-board one won't play ball with your CPU card.
Still, if you're determined to get a DMAC-04, I wish you the best of luck.
Thanks. I know, ehm.. it's a thing of me to want the last revisions
You never know if.. when..