no replacement eprom needed on that one, but you will need a 4 gig CF card with IDE adapter for the image file. Its actually just over 2 gig (after you decompress the CHD file)but since they dont make 3 gig CF cards your stuck needing a 4 gig.......or you could just get a 2.5 gig harddrive...
Theres a guy on ebay that sells just about every type of arcade harddrive, you should hit him up.(except Killer Instincts, I used to sell KI CF cards and eproms)