Ricoh Pro C7210sx Staples

[CreoleCuisine]

Machine is telling me I'm almost out of staples but doesn't tell you which refill to order.
I use saddle stitch and left corner staples.
My vendor is telling me this machine uses T, X and U.
T is for the saddle stitch, does anyone else have this machine that can help me figure out what the X and U are for?
Not sure why it uses 3 different types.....

 

[namelessentity]

Their website has photos.
I'm not used to 3 types of staples on a printer, but generally the corner staples on most machines are a rectangular flat sheet of staples, and the booklet staples are in a round case.

 

[CreoleCuisine]

Their website has photos.
I'm not used to 3 types of staples on a printer, but generally the corner staples on most machines are a rectangular flat sheet of staples, and the booklet staples are in a round case.

after a 30 minute chat with an online ricoh agent, the U is the cartidge the staples fit in. X is the refill.