I just installed it to a clean Zen Cart v1.5.1 ...
Can you tell me what it is you think "breaks"? I cannot break it ... 
I cannot break it and changing line 236 on both:
Code:
$mline .= ' <blockquote><a href="' . zen_catalog_href_link(FILENAME_PRODUCT_INFO, 'products_id='. (int)$basket->fields['products_id']) . '">' . zen_catalog_href_link(FILENAME_PRODUCT_INFO, 'products_id='. (int)$basket->fields['products_id']) . "</a></blockquote>\n\n";
seems to work fine to remove from the email and then, as the customer, go to the Product via the link in the email ...
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