it is difficult to get square post batterys now mate, tried 3 factors in nottingham last year when trying to get a battery for a escort, same story from all three, square posts have been discontinued and thats from five different manufactures (bosch, moriu, oldham and two others i can't remember). i ended up fitting a round post with adapters as posted by dazzle740
the one you got might of been one of the last square post batterys they had in stock