OK, Ive looked at pictures and now Im more confused. Some have thin grill moulding tops (the part that says chevrolet) and some are thicker.

I picked up a new grill cowl for my 39 GMC but I think its a 40 chevrolet, didnt know they were different when I picked it up. To make matters worse my truck is actually a GMC so I cant compare the old with the new. But I do know hat the grill top from my 39 gmc does not fit the 40 chev cowl.