hard drive replacement part - temp sensor doodad

I have a mid 2010 imac and had to replace the hard drive. The original hard drive was a Western Digital, but my replacement is a Toshiba. Installed it myself and everything worked out great, surprisingly, except for one part. The original heat sensor wire from the Western Digital doesn't fit the Toshiba. Can anyone tell me the actual name of this thing and/or point me in the direction where I can purchase this wire/sensor for the Toshiba hard drive?