GM for years used spacing sleeves to strengthen and stabilize accessory brackets. I would start by soaking it with PB Blaster or a similar rust penetrant,then if worse comes to worse if you have room turn the entire assembly till you get it off then hammer it apart. You can heat it but wouldn't recommend that unless you have experience. If you can't spin the entire assembly the cut the head of the bolt off respray with rust penetrant and try and gently pry the bracket off the fastener and sleeve. Make sure upon reassembly to apply a liberal amount of anti-sieze compound. Hope that helps.
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