The early 2006 or early 2008? There is no 1.83 Ghz model in the early 2008. MacTracker says the early 2008 can see 6G but 4G PC2 200 pin 5300 sodimms are hard to find. I didn't even know that 4G 5300 were available. NewEgg has them for $70. I found only one other place, Walmart of all places.
The "kits" just refer to 2 chips BTW as you probably know, it's a marketing thing for machines that can utilize interleaving, 2 chips the same size.
Edit - Okay, I see Crucial does have 8G "Kits" but they are $240.
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