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If you can find it, I strongly suggest that you get enough to do the whole job. My experience is that finishes can change from one lot to the next, so the two legs you get might not exactly match the two you've already got... and if this is a "very picky customer" they're likely to notice...
You may want to call International and ask them who are the last shops who ordered any significant quantities of it, and either a distributor or private frame shop might be able to send some your way!
It is listed at IM as a Disc and Sold out. International has many many more distributers. I would check with Frame King in KY. They still have it on there site.
There phone is 800-543-5464