Sorry pal, but that won`t fit. You either would have to saw the part with the RAM-socket off of the quickpack or you have to remove the Zorro-daughterboard of your A4000.
have a look at the picture.
http://www.amiga-hardware.com/quik4060.htmlWhat makes you say that those card are easy to find. Here in germany I haven`t seen even one of those and I had quite a lot of Amiga-Hardware in my hands this far.