Easy part first: SATA I (1.5 Gib/sec), SATA II (3.0 Gib/Sec), and SATA III (6.0 Gib/sec) use the same physical interface and the same connectors.
That said, I'm looking up your drive to see if it uses mini-connectors or some such thing.
Curiouser and curiouser. I looked that drive up, and if it's the Scorpio model I see it has perfectly normal connectors. Here's a link to a picture: http://www.pricedbelowmarket.com/computer-parts-hardware-hard-disk-drives-hdd-western-digital-wd1200bevs-22ust0-scorpio-wd1200bevs-120gb-sata-15gb-s-5400-rpm.html
. The connectors on the left are standard (or mini?) SATA power and data, followed to the right by useless jumpers and the old-style power connector.