Are you just looking for a generic external case for your drive or are you trying to find a replacement WD case?
Let us know
If you grasp the drive and the circuit board and pull firmly the two should seperate and you will be left with the circuit board in one hand and a generic WD SATA hard drive in the other whose ports look like this
With the board removed do you have a set of connectors like this
Can you look at this video and watch around 34 seconds when the USB to SATA circuit board is removed http://www.youtube.com/watch?v=cQ0bgz3tyNk&feature=fvw
Let me know if your drive is the same, If so a standard SATA external enclosure or cable will work for you like this from Buy.com http://www.buy.com/retail/product.asp?sku=210912062&listingid=39754146
Or an enclosure like the Startech integrated USB2 http://www.pcconnection.com/IPA/Shop/Product/Detail.htm?sku=10746851&oext=1038A&ci_src=14110944&ci_sku=10746851
Let me know if your drive is different to the one in the video
In that case can you tell me what the label says so Ican make sure which version you have so we can help find you the correct case.
Does the drive look like this?
No it does not look like the last picture either
At the top it has
Drive parameters: LBA XXXXXXXXX 500GB
At the bottom it has
Serial ATA Hard Drive
Dated: 13 SEP 2009
In that case I am going to have to opt out as the first picture I sent you is a SATA drive and if yours does not have an external connector I do not have the slightest idea what drive is in your Passport.
I just took my 500GB Passport appart and it is just like the first one I posted after you remove the plastic cover then the wrap and unplug the USB adapter.
Just sit tight and another expert will be with you shortly