And here you can check that filter 21 003 fits the Honda HRV
https://catalog.mann-filter.co…V%20II/1.6%20D%20(T255023)
The first 2 letters indicatie only the type of filter.
CU is just plain paper, FP is the new biofunctional type filter ( seems that Mann did not update their product finder for this new product line).
21 003 is the size coding for the filter.
Viel Erfolg,
Erwin