I just ordered and paid for my new canvas. 2-3 weeks delivery, cost including gst and freight was $1500.
Might sound expensive, but it means the torn, mildewy canvas will go, and it is still within my budget.
Part number was HYG3030 which is the GS model.
I found the part number on the inside of the canvas and ROBCO underneath it. I checked the GS RPS and the part number lined up ok.
Someone with an FFR or FFR RPS should be able to find the part number for it, but when I spoke to them this morning, they knew the difference!