awning roof poles

Hi, I need some extra roof suport poles for my Inaca awning because I intend to leave it up on a seasonal pitch. Its a big awning on a Hobby 650. The poles are fibre. I have trawled the net and ebay with no luck and I am struggling to find a stockist.

Can anyone point me where to go? Can I use other manufacturers poles? would it matter if I used steel or alloy poles mixed in? many thanks, Rich (Sheffield)