Hello Ina,
I am sure it is part of the screen so unlikely you can get the plastic separately but I have never had that problem before so not 100% sure, if it is cracked but the display is normal it may be separate from the board, tryu www.sewusa.com and see if they have a schematic of the machine, you may be lucky, I have not seen that model for years.
Ken
drivewithken
June 2010