I'm pretty sure these are the stock caps for the 89 wheels (machined finish). I was going to shave the ACURA off of mine so people would be less likely to want them. Not sure if it will work, though.
http://cgi.ebay.com/ebaymotors/ws/ebayISAPI.dll?ViewItem&item=1820635020&r=0&t=0
http://cgi.ebay.com/ebaymotors/ws/ebayISAPI.dll?ViewItem&item=1820635020&r=0&t=0