(1 set of 2)Riccar 4000 Series, Upright Vacuum Filter 4950, 4900, 4812, 4512, 4810, 4508, R-Series, R500, R600, R700, R800, R800C,Vibrance VAC 28, 2000, 4000, 4508, 4512, 4612, 4810, 4812, 4900A, 4950A, R500, R600, RF4-2 4810, 4512, 100 4812, 4900, 4950,