One advantage of fluorescent bulbs is that they last very long and therefore are cost-efficient. This particular model has a so-called G13 socket, so make doubly sure that it will fit.
Conrad Electronic
OSRAM Fluorescent tube EEC: G (A - G) G13 58 W Cool white 840 Tube shape (Ø x H) 26 mm x 25.5 mm 1 pc(s)