[kcsa75]

I've found the best places to find stuff like this is a swap meet. I needed trim rings for my rallies a couple years ago. When I got to the swap meet, the second or third booth I visited had three matching rings.
I wasn't going to buy them because I needed four. The price was right and the guy said something along the lines of "you shouldn't have any trouble finding a match out here."
Well, he was right. I found a matching single a little later and was good to go.