[cflsystems]

Yes the code for the extra fields in 4.3 as well so no need to hack it (it is in include/search.php). Try the debug window and see how extra fields are shown there - as separate array or part of the products array (I would assume is part of the products array for each product). It shold be
$product.extra_field[0].field_value
for values when [0] is the extra field id or you can loop the array