These are the correct washers with the threading lip so they will screw down and be retained onto the sump plug thread as per original MG specification.
Oil Sump Drain Plug For VAUXHALL Crossland X Grandland X Combo E
Oil Pan Sump Drain Plug Repair Kit for M12 X1.5 M14 x 1.5 M16 X1.5
FEBI 30269 OIL SUMP DRAIN PLUG M14 x 1.5 WITH SEAL 17MM HEX SUZUKI HYUNDAI A4836
M13x1.5 Oil Pan Sump Drain Plug Repair Kit for M12 x 1.5
FEBI 47197 OIL SUMP DRAIN PLUGS x 2 M14x1.5 SEAL AUDI VW SEAT SKODA TSI/TFSI
OIL SUMP DRAIN PLUG FOR NISSAN ALMERA INTERSTAR MICRA NV400 X-TRAIL 7703075210