Where can I find replacement blade arms for a hampton bay ceiling fan?

e75795
Model: ac-552 (sku#474-628) "KK"
Mfgr no. 5a 00007

Upc# 718212040300
Vendor# 445993
s/n: 004136D

Thanks,

Kean

Ps: what's with the caital letter restriction in this forum? :)