Choose the part of the vehicle where the spare you are looking for is located, you will then see the part diagrams of your 1973 Boxer (69-76).

BMW Motorrad Classic R 90 1973

R 90 1973 Boxer (69-76) R90
Model: R 90 S
R 90 Boxer (69-76)
Model code R90
Year: 1973

R 90 1974 Boxer (69-76) R90
Model: R 90 S
R 90 Boxer (69-76)
Model code R90
Year: 1974