You could easily use extra fields for this as you have a limit of 10 additional fields or just simply hardcode the links and info in the product.tpl page:
Code:
{if $product.productid eq "16133"}
Product Title: {$product.product}
Some link
etc...
{elseif $product.productid eq "16134"}
Product Title: {$product.product}
Some Other links
etc...
{/if}
This is the basic jest, however if your client adds a new product your gonna need to make adjustments by hand since its not dynamic.
hth.
