You best get to searching the UK and Australian Surf forums, that's going to be tough to track down, and expensive to ship. Are you looking for the front bumper, or the factory bullbar?
I'm also trying to get this. I have tried to ask a few guys on YT to get the valence but they all seemed pretty hesitant to ship it. Theres a guy over on the rx7 forums that sources all the JDM parts for the rx7s and they offer this service for other vehicles. Here is the site.
Just remember that JDM parts come with a high fee. So was the price of my hilux surf tailgate plus tire carrier I haven't contacted them about the valence yet. I got my carrier through someone else though.