Can anyone identify these pickups?

[Elaine S. Hartstein]

The attached picture shows fronts and backs of three similar pickups. The pole pieces are different sizes, and the height of the cases are 3/8, 7/16, and 1/2 inches. I have no reason to believe they belong on the same guitar(s). They read between 5.4 - 5.65 K ohms. They must be at least 20 years old, probably more.

Can anybody tell me what they are? Also, would the shorter ones be neck pickups and the taller ones bridge pickups?

Thanks.

[FRANK]

they look like Rickenbacker

[FRANK]

hey those are mine