The first two are RK06 drive modules; the last three are RK07 drive modules (info from the 1983 Option/Module list).
So these go *into* RK06 or 07 drives? Interesting, these may have come with an 11/34 which had the RK611 controller (long since gone).
Well if anyone has an RK06/07 reach out before they go in the recycle pile. CZ
