jjenkins

hi all i brought a second hand but in very good condition strimmer but it didnt come with the blade fixing kit so i ordered one of ebay a genuine honda one but it was for a umk425 (not umk425E) on trying to fit the first washer onto the blade i noticed it didnt fit and it had 10 splines in it where this fixing goes it has 6 slots both parts seem to have the same number 06812 vj5 000he ,every one i have spoke to today say i have the right kit and it comes up as a 10 splines but i need 6 does anyone have the same matching machine or know why the same order number but 2 diffrent parts. i found one on ebay that is the same order number but is 6 spline.both images are on ebay but 2 diffrent things with same honda order number any help thanks