check out ifixit.com and find the part you need... they will list what comps there interchangable with (without modding :P)
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>Mac mini PPC / 1.42 Ghz / 1GB RAM / 74.41GB 4200rpm 2.5" / Airport + Bluetooth / 10.4.7 / 20.1" LG widescreen
>G4 400 PPC / 20 gig / 768MB RAM / ZIP drive / 10.4.7 /17" apple SD / Back up system
>Powerbook Titanium 1Ghz / 40GB / 512MB RAM / mashed up and waiting for a good mod!
>Macintosh SE/30