1985 carburated 5.0 issues any help?

the "fast idle solenoid" is physically broken. i need to replace it. how the heck to i locate one? i've been searching online and can't find a thing. napa, summit, mustang parts warehouses, none seem to have what i need. is anyone familiar with what i'm talking about and been able to locate the part? this is the part in this picture
mump_0907_07_z+holley_4180+idle_solenoid
 
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