Lower fan shrouds are very hard to find. Any good radiator shop should be able to make you a new core. Good luck with your restoration.
Catmatt
Radiator core here:
Cindy Frost
Senior Inside Sales Representative
Office: 1-800-733-2673 Ext 1208
FAX: 1-414-421-4090
ROCORE HOLDINGS
2401 DIRECTORS ROW R
INDIANAPOLIS, IN 46241
PHONE: (317) 227-2929
Tell her you are with the club. She will give you a discount.