As per Andy May's site http://homepage.ntlworld.com/asmay2002/wmc_wagon.htm Converted in 1987.
I'm wondering what they were converted to carry?
My understanding is the conversion was for mineral sands they worked between Capel and Eneabba. They ended up at Narngulu and were reconverted back to WMD with the extended sides for talc traffic. Will have to dig out some photos as I am sure that the sides were retained in steel unlike the wooden extensions on the rest of the WMD's.