I've heard it suggested that the Indians sometimes used shortened 1907 scabbards with their L1A1 bayonets but have not actually seen any evidence of them having done so. "OA" stands for Orange armoury, I believe, an Australianicon company. I have purchased, in the past, a couple of short Indian smle un-fullered bayonets that came with full length Australian "OA" 1907 scabbards.