Again, i don't understand why the trembuckers are not stated as regular spacing and the regular spacing as - lets say - "G(ibson) spacing or something.
A lot of guitars which are equipped with new humbuckers are strats, strat-like etc...
In the music shops here (Germany) i never have been asked what spacing i need, neither they usually have trembuckers in stock. When i first heard of them i already bought Duncans for 5 years...then i thought they are only needed for floyd-rose-guitars...