Yes, those are generally called radial shaft seals or sometimes wheel dust seals, and most bearing supply shops can usually match them if you bring the old one in and measure the ID, OD, and width accurately with calipers. A lot of mower manufacturers never sold them separately because they were considered part of the wheel assembly, which is why they can be frustrating to source individually. Since the Victa and Rover/MTD versions differ slightly in OD and thickness, your best bet may actually be an industrial seal supplier rather than mower parts dealers, because they can often cross-match generic seals that fit the axle and bearings correctly without needing to grind them down.
