Rotary 8439. WHEEL BEARING KIT FOR GRAVELY. FITS GRAVELY 45205 FRONT CASTER WHEEL ASSEMBLY. FITS 40" & 50" CUT MOWERS. KITS CONTAINS ROTARY #8404 ROLLER CAGE BEARING WITH RETAINER BUSHINGS & #8420 SPANNER BUSHING. FITS 08-8197 WHEEL ASSEMBLY.