[southern parts]

the core support will fit 67-72. It is a 67 -68 type gmc core so you can remove the headlight extensions and it will a 67-68 chevy core .
the grill is correct for 67 only , but will fit 67-68 as is
the top bar is 67-68 only,
change out the top bar for a 69-72 type and use the grill on a 69-72 truck or put a 67-68 hood on a 69-72 truck and use the grill as is.