I tried and tried to find the 32983 Anvil Gray ( Bumper and Hub Caps 1954 Chevy Truck 3604) and lo and behold I called Orielly's Auto Parts and they are able to use the PPG 32983 and cross reference within their paint system.
Do you have the O'Reilly's number or color name that you can share? That would help others looking for Anvil Gray.
Thanks