What's the right memory module for an iMac G4 Flat panel 15-inch?

Hello!
A new program I've recently bought requires me to expand my iMac's memory, which is currently 256 MB.
After searching the Apple Store web site, I think I've come to the conclusion that what I need is an Apple memory module called "512MB DDR266 SO-DIMM (PC2100), 200-pin". As I don't know any expert who can give me some advice, and as I'm no expert myself, could anyone please tell me if that's right?
Thank you!
iMac G4 Flat panel 15-inch   Mac OS X (10.4.8)  

Ciao e benvenuto alle discussioni di Apple. 
There are actually 3 different types of user slot installable RAM for the iMac G4 models so you'll have to check what your processor speed is (Go to  Apple Menu > About this Mac > ):
iMac G4 15" and 17" 700 or 800MHz, PC133 144pin SODIMM.
iMac G4 17" 1GHz, PC2100 200pin SODIMM
iMac G4 1GHz 15" or 1.25GHz 17"/20", PC2700 200pin SODIMM.
So although I can't tell you exactly what RAM you need I can tell you that if you have a 15" screen the PC2100 is wrong.
I'd advise using Crucial memory in Europe as the prices are amongst the best and they are Mac friendly. I wouldn't recommend Apple memory; it's overpriced. I also wouldn't advise buying a cheap brand as it could cause trouble.
Here are the fitting instructions.
mrtotes

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