Need some help.

I just looked at David Pozzi's site but can't find these part numbers:

GM408606 T27
GM408604 T22

I am trying to buy some steering arms and I need some from either a Camaro or 68-74 Nova that had power steering and disc brakes. A Team Camaro member is selling some in the classifieds but I couldn't verify if these part numbers are indeed Camaro steering arms or not. He says these are the numbers cast into the parts, which I believe according to Mr. Pozzi's site should be the same as the part number.

Can anyone tell me or know if there is a web site out there I can reference? I am not having much luck on Google either.

Thanks in advance.

Lee

For anyone that cares those part numbers correspond to Chevelle steering arms and appear to be for years 1964-1972.