don't know where you are located but i ordered something from hong kong off ebay once, ( 2 step up rings, 2 different sizes) they sent 2 of the same size took about a month to reach me then they wanted me to send the wrong one back at my cost before they would send the right one which would have cost me more in shipping than the rings originally cost ( ebay stepped in and made them send the right size and said they would have to pay to get the other one back which they never did). the rings must have been really cheap since they bent and i could only use them a couple times before they wouldn't screw on,,,never again

i'd try a camera store that might carry a quantrary or sunpak type brand of stuff and see if they don't have a spare, you might be able to get one for around $10 ( what my last one cost when i
thought i lost one, bought one then found the first one of course, stinkin black inside of the camera bag won again)