dang, almost had it. went and looked in my parts stash and only came up with a nos 'superior' brand wheel, not a covico.
12 1/2 with a 3 3/4 dish. Still has the tag on it, circa 1971 or there abouts, from my dads old parts.
oddly enough, I have a nos covico water decal from that era.
http://img.photobucket.com/albums/v2.../IMG_13612.jpg
try mooneyes, they should have what you need.http://www.mooneyesusa.com/index.asp...OD&ProdID=1695