Looking for a little help on wheels

[toolaidback]

I've got a 49 3100 body sitting on a 55 3/4 ton straight axle frame with 15" 6 lug steel wheels. I was planning on putting a set of drop spindles on it and will be looking for a 16" wheel. What are my options for wheels for this truck? Is there a simple solution to change over to 5 lug? Seems like i'm limited when searching for 6 lug wheels. I like plain steel wheels with whitewalls and probably chrome dish hubcaps.