American racing wheels on my stepside

[801stepside]

So I'm looking to get American racin wheels on my stepside. The ones I want to get are the torq wheels but I went online to their website and typed in my truck and they don't show those wheels to fit my truck? Will I have to switch from drum brakes to disc in the back to make this work? Has anyone installed these wheels on their stepside? Your info and help would be appreciated. I'm planning on getting these wheels and want to know what are the things I have to do to make this work. Thanks guys and gals. My truck is a 77 chevy stepside too by the way
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