i have a 05 27/60 ultracut that has the blades with the large hole for brass insert and i was looking for the part numbers for the stock blades and other options and part numbers that would fit my machine. basically i ran the stockers which were great and then ordered blades through buddy and i have noticed that the "aftermarket" blades allthough they are thicker and wider seem to tweak or bend alot easier as where it's leaving a slight stripe that i notice. i'm thinking mabey softer metal there made of. would like to get a few more sets of the factory ones as well as trying mabey the high lift or solid lift ones. anyware on line i can order them as my dealer is around a hour away and last time i order mulching blades i got mulching blades even though i explained that i wanted the "agressive" ones. much appricated!