I used three standard LP4-3 pop rivets on the top attachment hinge to the side of the baggage door, and two #8 platenuts and screws on the lower attachment.
For the correct geometry, you'll want to mount the upper hinge exactly 11/16" from the bottom of the door as shown in the pictures. The lower hinge should be mounted exactly 8.0" from the exterior skin of the fuselage as shown in the picture.
McMaster-Carr Part Number 11615A14
Baggage Door Hinge at 11/16" From Bottom Of Door As Shown
Lower Hinge Mounts 8.0" From Exteriror Of Fuselage As Shown