Epson FRAME TR RIGHT (1251313) is the right-hand tractor frame listed for the FX-2190 dot-matrix printer. It is a printer mechanism part intended for the tractor assembly, giving you the specified right-side frame component for that model.
The FX-2190 parts list identifies the item as “FRAME,TRACTOR RIGHT;EPAG” and lists one part. This description refers to the frame itself; the parts list does not confirm any additional components or accessories in the package.