I am nor sure if you are looking for a complete set of GM instruments, or just the designations.

Here is a fine free set of instruments for midi. http://www.geocities.jp/shansoundfont/soundfont.html
Here is the table.
http://midistudio.com/Help/GMSpecs_Patches.htm
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact