1968 and 1969 GMC wheels and base model hubcaps were painted argent silver.1968 and 1969 GMC hubcaps are different styles, so the 1969 argent silver painted hubcaps is a one year deal. Its possible some early 1970 GMC's (built in 1969) still used the argent silver wheels before the switch to white. 1968 and 1969 Chevy wheels and base model hubcaps were also painted argent silver. Agian, 1968 and 1969 are different styles, so the 1969 argent silver Chevy hubcap is a one year deal also. At some point mid year 1969, Chevy started painting there wheels white, but kept the argent silver hubcap. When new 1970 models were available (late '69) base model hubcaps were white to match the white wheels. Here is a photo of a 1969 Chevy pickup with argent silver wheels and hubcaps.
http://www.ebay.com/itm/Post-Card-Bl...item4cf53beb81