John Deere 54-inch Standard Mower Blade for GX, LX, X300, X500, X700, Z300, Z400 and Z500 Series M143520
GX Series (GX255, GX325, GX335, GX345, GX355);
LX Series (LX280); X300 (X320, X340, X380, X384, X390);
X500 Series (X500, X520, X530, X534, X540, X570, X580, X584, X590);
X700 Series (X710, X730, X734, X738, X739, X750, X754, X758);
Z300 Series (Z375R);
Z400 Series (Z425, Z435, Z445);
Z500 Series (Z525E, Z535M, Z540M).
Ensure you get the right blades, look up the mower blades you need at https://partscatalog.deere.com/jdrc/. Or put the make, model and serial number of your piece of equipment in the comments when you order and we will check it before we ship the parts.