The FIVEOMOTORSPOR.COM site shows the 19# mustang injectors as Bosch #0-280-155-710 and #0-280-155-700. The picture for the #700 injector does not look like the stock injector (0-280-150-714 for the M42/M30) though. While i haven't found a definitive picture of the #710 Mustang injector, from the bellow link it looks closer to stock than the #700. It is also not clear from the below link if the #710 is four hole or one hole? I say closer to stock because of the clip that slides into the groove of the injector and around the fuel rail port to assist with holding it in place.
It appears the benefit of the #700 injector may be that is has four holes (vice a one-hole pintle for stock or a one-hole disc-type for the #710) but you may need a washer at the manifold end in order to help hold the injector in place because the clip can't be used?
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http://www.fiveomotorsport.com/Injector_SetsBMW.asp