Inside this zip file is a single text file with the code and locations you need to edit.
This Edit Changes the Breadcrumb,
Replaces the product model to product name when viewing a product in category view,
Adds the product model to the end of the bread crumb only when viewing in manufacturer view mode.
Also includes further instruction on removing un-required top/catalog link from breadcrumb when using osCommerce as the main website (if exampledomainname.com were the shop page) and how to edit the text of the breadcrumb for top/catalog should you wish to keep one of them.