Dove Campers is actually in 24 Welshpool Road, Welshpool, (not far from the junction of Alban Highway)see their ad here.
It is two separate business's, the dad (Dave) owns the front sale yard, the son (Josh) the conversion workshop at the rear, give Josh a ring on the number shown on his addy, see;
You could try the little sewing shop inside the mall where the RAC is in Morley, I know they have the linen tape for curtain hooks (and hooks) if that is what you are talking about, also Absolute Care in Balcatta have a range of curtain things or can get them in, they supply some RV curtain makers, give them a ring; http://www.absolutecaravancare.com/Accessories.html SWMBO just got some similar items for glide tracks from them.
Dove Campers in Welshpool are also worth a try, that is where they do conversions including curtains (I think they order them off site) and have spares, but will point you to who could supply them.
We live near Dove Campers (South Perth, Kensington) pass it a lot going to my work. Think we may have tried them in the past ! but will give them a look see tomorrow
Now worries Mike, misunderstanding there, thought you were saying they were in Kensington South Perth, I realise now you were saying that is where you live, misread your post, sorry
I know them both too, have had a conversion done and other work done by them from time to time. They get a lady to make their curtains although they have all the tracks, hooks etc there. Say hello for me. One of their workers Mike returned to the UK unfortunately but I am still in contact with him, bonzer bloke.