Amiga 500 Expansion Board 2MB

[CJK3o3]

I saw this on an internet auction :
http://www.galerieallegro.pl/zdjecia/Galeria/941208/1
It's a 2mb expansion board but the dude selling it says it requires some sort of an adaptor for the gary socket. He is not selling the adaptor but I have one a500 8a mainboard with something like that inserted under the gary chip and a single wire coming out from it thats not connected to anything. Another wire is soldered to the jp2 jumper on the mobo.

Does anybody know if i buy this thing - will it work with what I already have?

[CJK3o3]

Thanks Lurch! I'm gonna try to order one.