Hello exmark In a catalog It shows Extra high Lifts At twenty And seven Sixteenths Length. my Owners manual has this part Number In It 633483. I thought My blade size Is twenty And a half. This is on the 2002 lazer z eps. can I use these Blades. and if no do you have a part Number For the extra high Lifts. I Think im Useing Them now but with all the mowers starting to look alike I'm Not sure. Maybe different Color Gas tank's would be easier thank you johnny G.