It's been quite a long time, but I think someone had them for sale here. Probably 14x6 though - did they make both sizes? My 71 GS455 had them.
Although these are likely gone, there are photos of what they look like here: http://www.v8buick.com/index.php?threads/1971-super-sport-wheels.266274/#post-2198980
I prefer the Super Sport wheels myself. In the past 30 years I have had and seen many 14x6's but never a 14x7. I have taken chrome 15x7's blasted & painted them then added trim rings.
Hey Steve.... In storage, I have a set of (4) 14x6 SS wheelz I would sell. In all my years with Buicks, I've actually never seen 14x7 SS wheelz... Wheelz, Tampa Bay