[cflsystems]

For related products try this (replace 0 with field # you want to show)

{$product_links.extra_fields.0.field}: {$product_links.extra_fields.0.value}

For recommended products try this (replace 0 with field # you want to show)

{$recommends.extra_fields.0.field}: {$recommends.extra_fields.0.value}

This is on product details page