I bought both of those panels repro from JK I think (pretty sure they were made in the UK) and they were surprisingly good quality, there's pics on my build thread of the fitted items.
Give South West Splitz a call, they import buses from Oz and have spare parts.
http://www.southwestsplitz.co.uk/index.php" onclick="window.open(this.href);return false;
How good do they need to be?
I have my old RHD ones, I gave them a very quick wirebrush and they are solid but heavily pitted in places inside. No holes though. the non slider side is a bit squashed towards the rear, not easy to see in the pics.