Well I,ve fitted the new filter and was not too happy about the fit,it had a large gap between the top and bottom of the housing,then I remember reading about about the seals and lo and behold...2 seals ,one in each half of the housing,very difficult to spot as they look part of the housing,removed them and now a perfecr fit...only thing to do now is try it out...after I,ve done the fork oil.