Landpride 15 series, RTA1550 tiller knife replacement

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Rototiller knife replacement
Landpride 15 series
RTA1550 (6 flange)
Parts for replacement
820-056C / Tiller knife RH
820-055C / Tiller knife LH
802-248C / Tiller Knife bolt 1/2"-20 x 1-1/4" Long Gr 5
803-018C / Nut, Hex, 1/2"-20
804-015C / Washer lock 1/2"
I bought the knives from a local tractor shop. They have increased in price they are at like 13$ per knife right now. It is astounding.
I bought the hardware from Tractor Supply out of the bins. Cheaper to do it that way. Not much difference just make sure to buy the same grade. Don't want them wearing out. Plus don't make the grade to high as you want the bolt to shear before the flange.