That bit of code you have posted checks to see if you have a "configurable product" which uses the configurator add-on so I doubt it is generating your product number listing.
It appears as though this is the code to display the product code/sku {$products[product].productcode} but I can't find it in the product.tpl file so it must be part of an included file within the page. You may have to dig around for it a bit. I'm new to X-Cart so I can't give you much more direction
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