Now I can see the action part:

Code:
http://mowerpartsupply.com/catalog/cutting-blades-mower-blades-c-66_68/gator-lawn-mower-blade-p-183/action/add_product
But not exactly in the correct form. Are you sure you:
1. upgraded to 3.6.1
2. updated your config settings (exclude query list)
3. Clear SSU cache via SSU Manager?

Because if you did you can not have url in this form.