Several places have repro stock wheels..for instance:

http://www.lmctruck.com/icatalog/ca/search.aspx?searchItem=steering wheel&rURL=~/t.aspx?Page=1

I think Brothers and Classic Parts have them too.

 

I have a very nice used one from my 57 Suburban. It has hairline crack in each spoke where the spokes meet the hub. The suicide knobs were just clipped on and are no longer there. Here are a couple pictures when it was in the truck, It is out now. PM me with your email address and I will send you better pics and details.