Drupal Commerce - "Select a product" element: How to change the select list to radio buttons

Here is the code that changes the default select list of "Select a product" element of Drupal Commerce to radio buttons, for a standalone product list. The following goes in a custom module (tested in Drupal 7). Check this for code for the product select list shown in conjunction with product attributes. -- UPDATED!! -- Further to Ryan's comment below, here is the updated code where options are sanitized. ( Sanitize = convert to plain text -> remove html / js. Without this, html / js included in product titles will render in product options, posing a security threat.) $value) { $form['product_id']['#options'][$key] = check_plain($value); } // Change element to #type radios. $form['product_id']['#type'] = "radios"; } } ?> Further discussion takes place here.