I have few different Mag tapes that don't have the
Rack Hinges that
they hang on. I would guess they are different from model to model ???
They part with the black hanger-hinge is generically called a "tape seal"
and more specifically a "Wright-line tape seal".
There are similar seals with stiffer plastics used in auto-loading
(and auto-tape-seal-removing) tape drives.
And there are also thick plastic covers (usually with twist handles)
that can encapsulate the whole tape, including the reel.
Tim.