Mod Rewrite Problem

I have several hundred links that need to be changed due to a vendor changing their product url's.

Here is an example of the original url

http://www.naturessunshine.com/us/product/tofu-moo-natural-225-oz/sku-1703.aspx?actid=322

Here is what I need to change it to

http://www.naturessunshine.com/us/product/tofu-moo-natural-225-oz/1703/?actid=322

This is the rewrite I built but it doesn't seem to do anything.

RewriteCond %{HTTP_HOST} ^www.naturessunshine.com$ 
RewriteCond %{QUERY_STRING} ^actid=322$
RewriteRule ^us/product/(.+)/sku-([0-9]+)\.aspx$ http://www.naturessunshine.com/us/product/$1/$2/ [R=301,L,QSA]

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This is above the rewrite string I created

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

# -FrontPage-

IndexIgnore .htaccess */.??* *~ *# */HEADER* */README* */_vti*

<Limit GET POST>
order deny,allow
deny from all
allow from all
</Limit>
<Limit PUT DELETE>
order deny,allow
deny from all
</Limit>
AuthName www.abc.com
AuthUserFile /var/www/html/_vti_pvt/service.pwd
AuthGroupFile /var/www/html/_vti_pvt/service.grp

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Please tell me what I need to do to get this rewrite to work.

Thanks,

Randal