Sealing gasket

We have received Digikey part numbers 1508-1302-ND and 1508-1303-ND.
There is not a sealing gasket on these parts. We need the parts with sealing gasket. I need to know the correct part numbers. If they are not correct part numbers, could you please propose the correct part numbers which have the sealing gasket?
Should the correct part numbers be 571-DMC-M20-22SNE and DMC-M 20-22 PNE ?

Welcome to the Digikey tech forum. You are correct with the two part numbers 571-DMC-M20-22SNE and DMC-M 20-22 PNE you listed as being sealed, the E suffix designates sealed as shown here on the data sheet, sw2pvdr0 (