Kruz, I think you will be fine but I recently considered buying tires from overseas and the ad cautioned you to check customs rules for fees. I don't think there are any for non-ingestable items for personal use unless they are considered contraband items in the US like maybe a spring loaded lock blade knife or something like that.
BobZ, I just called Partzilla and they told me the part is unavailable, no longer in production and they do not have any information on a superseded part or when such a part would be available. I don't know where you are getting your information that the part is available under a different part number.
I could not find lowers for my 08, either. Just ordered a tail fairing from them and it is delayed until May 24 but the lowers are unavailable where you would select for your cart. The LH lower is not even on the list to select.