Roof Bars for 2004 Nuevo

Trying to fit my Nuevo 2004 with roof bars. The bars themselves are easy enough to source but the fixing brackets that will fit into the recesses provided seem to be impossible to find. None of the standard fittings seem to be suitable. Could anyone supply me with a drawing or photograph so that I could have some made.

There is an active topic going called Nuevo roof bars.
They are no longer available from AS. I am after them as well to fit a solar panel on them. If you know where to find some let me know.  The feeling is to get some aluminium square tubing and fit yourselve. Steve came up with an idea. I think I will get the aluminium and drill one hole to fit over the bar studs and a larger one above to take a socket to attach.