That's them. My Dad had some from his days in the 8th Air Force, WWII.
The were used with the Wool/ Gabardine officers shirts which are similar
to some police shirts today
Little late here. Just began looking for stays myself, and found this thread. Also found this link: http://www.grunt.com/2-piece-metal-collar-stays/?utm_source=sgnews&utm_medium=email&utm_campaign=nlsgA100511
I think this is what you're looking for.
I too have been looking for one peice spring loaded collar stays, also refered to as a "Spiffy".
I finally found them, ordered two and they are the correct ones, 'M" shappes with spring each side.
There are still manufactured by Reliable World Trade Co., Inc in Oakland, California; however, they apparently only sell to military uniform shops.
Individuals can order them from John Helmer, Haberdasher in Portland Oregon www.johnhelmer.com
They charge $6.00 each with no shipping charges.
While many of the replys poopooeed the idea of even wearing such a contraption, If you want your collar points sharp and staying down, this is really the best invention.