I bought one of those backrests from Ebay. Let me start by saying that I was impressed with the quality. It looked as good as the Indian one and even the upholstery matched the Indian seat. However, I quickly learned that Indian used 2 different Spool sizes. My bike had hard bags on it already and the larger outer dimension of spools. The backrest did not fit on my spools. I thought I was going to have to return the backrest, and then I found out about the other size of spools. I ordered the smaller outer diameter spools and everything fit fine. My hard bags are still in place and the backrest fits. So, the answer is, it depends on what size spools you have. Somewhere on here, someone posted the dimensions of the 2 different spool sizes and I would ask the seller what size his backrest takes. You might just have to buy a different set of spools which the Ebay seller also sells for a lot less than Indian.
Rob