Honda Cb550F bobber question for motorcycle gurus

hey guys, got a random question for the motorcycle gurus here. Im making a bobber out of my 76 honda cb550f and had a few questions. first I want to stick a wider tire in the back, where can i find wider rims that will fit? and also i eventually want to get a rigid frame for it. where is a cheap place to get one that will fit it? thanks guys
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