Western Digital, Enclosure, sata data doesn't fit?

If the enclosure's data cable can be replaced, you could get a SATA data cable that fits the HDD connector and use that in the enclosure. Although, from what I read online about this enclosure, there is very limited room inside, so you might have a problem fitting the cable inside.
I personally use a Thermaltake blacx "drop-in" SATA enclosure (actually, is more like a HDD bay than a full enclosure). Excellent cooling of the HDDs, can just drop in the HDD and remove it at a whim if needed... perfect for my needs. You might want to check one out for future reference.

Which model of the Sabrent 3.5" SATA/IDE hard drive enclosure did you get? Is it the one with the external power supply the EC-UEIS7 which has a USB connector? Internal SATA hard drives have a L shaped connector for both the power and data.

it has the usb port that doesn't look like the rectangular flat usb that most people see. The drive has the L shaped pieces for both but the included cable does not.

The box says: ITEM: ECS-STU35K

http://www.tigerdirect.ca/applications/SearchTools/item...

This is what I use (except one can find it cheaper online, and I believe there are other manufacturers of similar designs):
http://www.thermaltakeusa.com/Product.aspx?S=1268&ID=16...

So does anyone know if I need a new cable or not?

I believe you do, see my first post.