To replace the original CDROM drive, you need an : ATA/IDE slot-in Superdrive, 12.7mm high.
Some compatible models are :
Matshita UJ-815-B
Matshita UJ-85J
Matshita UJ-845-C, UJ-845-CA (RPC1)
Matshita UJ-875-B (RPC1)
Sony Optiarc AD-5630A (RPC1)
Sony Optiarc AD-7630A-01 (aka Sony AW-G630A; RPC1)
Sony Optiarc AD-7633A (= 7630A + Labelflash; RPC1)
Sony Optiarc AD-7640A (= QSI TDW-081 = AD-7670A ?)
Ty this link also:
http://www.cubeowner.com/forums/index.php?showtopic=9245