Two 512MB FB-DIMMs with full heatsinks? Where?
Did you read his original post? DMS. Here is the one he was talking about. DMS is a terrific vendor...they know Macs in and out, guarantee their products to work in Macs, and stand behind everything they sell.
I have no hesitation in recommending DMS. Same goes for CanadaRAM...you'd be hard-pressed to find someone here who knows more about RAM than he does.