non-Seagate drive cases for GoFlex Net STAK100?

Are there any external drive cases out there I can by separately that fit in the GoFlex Net?

I got a couple 500GB GoFlex drives on clearance. I was told they were marked down since they were USB 2.0. I figured since I was doing SATA anyway it seemed like a good deal.Little that I know that these were an older model drive where the interface was not provided as a separate adapter but integrated into the case (like pretty much everything else out there for external hard drives).

So I ended up scavenging the drives and they're standing relatively unsupported in my GoFlex Net. I'm using the top half of the cases, along with some electrical tape, to provide some support. The bottom part of the cases have a lot of busted plastic snaps because the drive removal was so difficult. I figure I can get a generic case and dremmel off the back section, but I'm hoping for something a little more elegant.

The GoFlex Net supports Port Multiplier function, so I have attached a 4 Bay eSATA Enclosure -- http://www.newegg.com/Product/Product.aspx?Item=N82E16816132029 and connected it to the GoFlex using these cables

1. http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=150489406000
2. http://www.chinabestmall.com/15-7-pin-male-to-male-serial-ata-sata-22pin-data-extension-cable.html

So you can put 4 normal 3.5" drives to the enclosure and each hard disk is shown as a separate disk in the GoFlex Net.