Been trying to find a place online to buy a replacement blade for a Husqvarna 5521CHV. I am in the military in Japan so I just can't go to my local dealer to get one. I have a 21" Husqvarna Mulcher/rear bag mower. Any blade will do but I prefer a heavy duty one that won't bend as easilly as the factory on did. It says in my owners manual the Part No. is 532 18 90-28. Is there is a better aftermarket blade? Thanks in advance for any help. Its my 1st mower.