So visited store and got s sample curtain ring home which was right size for the curtain rod. Placed order for metal rings with Sedar over phone and in color of my choice. The salesman told e delivery would be to my home in 5 business days and the curtain rings cost me QAR96 for a set of 16 rings in color of my choice.
Not bad service though bit pricey. At least I have my curtain problem resolved!

Just FYI for anyone out there who finds themselves in similar situation - Sedar does address this request. Thanks Sedar!