During configuration, for selecting product details like ASIN, item number, Best Seller Rank (BSR), dimensions, shipping weight etc. we recommend that you use the Capture following text option. This makes sure that the selected detail is captured even if its location on page changes from product to product. For extracting 'sold by' and 'rating' regular expression strings are used, which you can find in the video description.
We recommend that you download and try the free evaluation version of WebHarvy.