This item is produced by BMW specifically for K bikes, but makes a great travel funnel as well. The BMW K-Bike Oil Filler Funnel is portable and reusable. Throw away your expensive paper funnels and your trumpet style sideways funnel--This is all you need. In fact, you can replace all of your big, bulky funnels with this compact, travel unit and keep it in a plastic bag under your seat.
BMW Motorrad Rubber Oil Filler Funnel
BMW Original Parts