Two are required (one on each side of the banjo fitting). Last photo shows them on an actual banjo bolt for demonstration (bolt not included). With 10 pieces you can replace all of them and have a couple of spares.
ASTOU 2917 Radiator and universal Oil Radiator Hose Clamps Kit 8-10mm 27-51mm Compatible with for Toyota Camry 2.4L 2007-2009 for Toyota Camry 2.5L 2010-2011 Automotive Replacement Engine Radiators
KILOAUTO 2817 Radiator and universal Oil Radiator Hose Clamps Kit 8-10mm 27-51mm Fit for Toyota Avalon 3.5L 2005-2012 for Toyota Camry 3.5L 2007-2011 for Toyota Venza 2.7L 2009-2016 Aluminum Radiator
ASTOU 2436 Radiator 8MM-10MM 30MM-50MM Hose Clamp Compatible with for Toyota Camry 2.4L 2002-2006 for Toyota Solara 2.4L 2004-2008 Automotive Replacement Engine Radiators
SCITOO for 1987 1988 1989 1990 1991 for Toyota Camry Wagon 2L Auto Radiator and 8-10mm and 27-51mm Oil Hose Clamps
ARP #203-4304 Head Stud Kit Fits Toyota 1.6 10mm x 1.25
Bolt Kit - 6pt. (5) 10mm x 1.5 x 60mm ARP 662-1008