Most upholstery shops should carry black canvas...sunbrella is the good stuff. Most plastic hardware for biminis is black. You could look on craigs or ebay to find most used or new. The frame might have to be anodized or some metal supply stores carry anodized straight pipe in a few colors and sizes. I believe the more common size is 7/8 ext. You could modify up to the bend with a reducer joining the straight to curved area...You wouldnt see the curved as its underneath.