Weighing in late, but I thought I'd share my experience. Pretty much everything on the Brick related to fuel injection is Bosch, and Bosch makes very few bespoke parts -- their catalog is deep enough that they can serve pretty much any application.
What that means is there is almost certainly another application for most of the parts, and that application is potentially cheaper. In the US market, Bosch supplies VW, BMW, Mercedes, Audi, Volvo, SAAB, certain years of Jaguar, and many Fords. In Europe the selection is even broader.
Bosch FPR's come in a number of form factors, but the most common are "inline", which has barb/flare i/o for hose connection, and hard mount, which mounts direct to a fuel rail with an o-ring. Depending on what the bikes use, there are probably a dozen alternate applications.
Other than impedance, Bosch fuel injectors are almost all identical in size and form factor (which means you can get the sealing O-rings and replacement electrical plugs cheap at NAPA). In general, there are low and high impedance windings. On cars, L-Jet use high impedance, I can't confirm on the bikes as I don't know enough yet. Motronic systems use low impedance, and there is a newer version (referred to as EV6) that has 4 holes instead of one, for better fuel vaporization. They are approved for E85 fuel, and in most applications improve mileage. I swapped from EV1 to EV6 on my V6 Alfa, and it provided a noticeable improvement in low end grunt.
