Dufflecoatsunrise

Hey Guys, I only have one key for my car now as I lost one, luckily I still have the master. But could someone please tell me if the innards from any other lexus key will do for making a spare as the IS200 keys with the innards are not available on ebay. I have no problem finding a shell for it but getting one with the electronics in it is a bit trickier. Cheers in advance!!