Window Locks

The windows are old International Windows, circa 1994.The locks are plastic with a metal plate to help open the windows. The hole spacing is 2 1/4" apart. The "tang" or piece that moves to lock the windows goes into a recess on the other, fixed side. There is no receiver.  I've tried locks that are available from my local home improvement store but they require new holes further from the edge of the window because the "tang" on the new locks are too long.  I need several replacements, on the order of 10 units.