Gilly, thanks again for the response. I did remove the wheel and fender liner, the picture I posted is my vehicle. I can not imagine trying to do this just by prying and holding the liner out. From reading your response and doing this one time myself, I think the key is removing the clamp. When putting in the longer filter, I did undo it to fit it in. As for the name "end cap", I got that name from the WIS system. Must be a poor translation from German?