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Yes that will work. The connector type in the iMac is JAE, but it uses the PATA protocol. The connector is sometimes called an ATAPI connector, it also uses the PATA protocol.
 
Yes that will work. The connector type in the iMac is JAE, but it uses the PATA protocol. The connector is sometimes called an ATAPI connector, it also uses the PATA protocol.

Sorry if I'm a still a bit murky on this Intell, but are you sure this caddy will do? My doubts come from a photo I recently saw of the optibay that shows what appears to be a male JAE connector on the motherboard. This plugs into the Supedrive optibay caddy, which according to another photo, sports what looks like a female JAE connector. Presumably, the Superdrive itself plugs into a PATA connector, which is coupled with this JAE connector.

If my understanding here is correct, and if the caddy linked above does not have JAE anything (only PATA), then the caddy (or bare 2.5" SATA HD) will not marry to the male JAE connector on the iMac motherboard.
 
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