Don't buy a fan...
I doubt that you can easily get a replacement fan and I suggest alternatives.
For my sprightly Inno3D 8600GT with a buzzing fan, I bought this.
http://www.arctic-cooling.com/catalo...ath=2_&mID=105
I have a well ventilated cabinet with good air flow and the passive cooler maintains a temperature about 41C. Arctic Cooling was my choice of purchase in Denmark, but there are several other makes and models. However, the model I linked to would fit your 9500GT card.
Otherwise, you might buy a VGA cooler such as used if you were to overclock. Google for your card and VGA or overclock, or look at the home pages of the best known manufacturers for a model that fits your card. Here is the Newegg link as an example of what there is to be found and some brands of coolers.
http://www.newegg.com/Product/Produc...rchResult=True
Both of these solutions seem more expensive than a replacement fan, but they are at hand, while a cheap replacement is not, though your present fan, still failing, certainly is.