Hey - I just realized that pickup looks a LOT like the Hi-Flyer pickups I recently bought. I'll measure them when I get home and see how they compare to the ones I received. The mounting ears are in the same place, so IF they fit, you might be in luck.
Later edit: no luck. The pickups I got are 7.6 CM wide, 2.3 CM tall and 3.4 CM front to back. String spacing between the edges of poles 3 and 4 is 1 CM. Doesn't look like a fit.