help with 69 c10 6lug to 5 lug

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hey everyone im a new builder from the bronx new york im working on a 69 c10 stepside will post pics soon im having a terrible time finding rims for my truck its a six lug and i have noticed that most trucks have the 5 lug set up is ther any way that i can swap out my six lug to a 5 lug set up i want to use 20 inch rims with 275/40/20 in the rear and 245/40/20 in the front please help out and my thanks goes out to tripro who introduced me to this great site