These are aluminum tags that were used on the early 1950s cars. The reservoir mounting bracket had four tiny slots and the end tabs of these tags were inserted into these slots then bent to hold them in place. The brake fluid was very corrosive so few of these tags survived. Early Brake Fluid Reservoir Aluminum Tag.
The 250s used a German Z.F. steering gearbox. This is a small, black metal tag, 20mm X 50mm that identifies the pat number and serial number of the steering gearbox. This one is a duplicate from a tag on a 250 Short Wheelbase Berlinetta. Z.F. Steering Gearbox Tag
Ferrari had a long relationship with the Shell oil company. A lot of the early cars had some type of metal tag in the engine compartment specifying the type of Shell oil to be used. 212 E-1 Shell Oil Tag, 100mm x 60mm