Hi folks, New here and have a question. replacing worn camshaft on my 17.5 intek, ordered a new one to replace it but i recieved one with an oil pump slot which mine does not have, also there are two washers on the other end of my original and not on the new one. can i still use the new one or should i reorder a different one ? model number is 31C707-0230-E1 , i ordered part number 793880 aftermarket online cause i cant get original briggs part till Nov. Thank you.