Ben, since you were curious about the filter location change, I did a side-by-side of the 3 versions I've had.
I also used to have a handful of Subaru 555cc injectors that are known to fit our sidefeed fuel rail, and their filter location is lower, like the newest one OP has.
I also used to have a handful of Subaru 555cc injectors that are known to fit our sidefeed fuel rail, and their filter location is lower, like the newest one OP has.