opposite lock

iTrader: (3)

anyone know what sierra has these shafts , a friend just measured up on a pair of what he ,s been told are cossie items ( 28mm dia) but we,ve measured mine (2wd saph 89) and their 31mm ish or thereabouts. We were thinking they must be normal sierra or maybe from a 4x4 cosworth . Does anyone know what they could be off of, if Sierra at all?
Thanks for any suggestions
Mike