Digital BW, The Print

Can anyone please tell me how to reinstall the original hardware that holds
the 1160 cartridges into the printer carriage?  When I installed the MIS CFS
system, I removed the two purplish colored covers which lock down the carts
into the carriage.  Now I want to go back to regular carts and am a bit
stumped.

These two purple pieces each has what looks like a hinged black plastic
square frame attached to it.  This black piece is what I can't figure out!
These attach toward the back of the purple piece and have a hinged range of
motion.  I can't figure out how these pieces fit into the puzzle so that I
can actually install the carts.  I am pretty sure these frames are what keep
the carts aligned into the correct position.

If anyone can refresh my memory, I would appreciate it.

Thanks in advance,
Doug