Briggs & Stratton NON GENUINE Air Filter ST1005099 ( Genuine part number 390492)
FITS MODELS:
146400, 170400, 171400 and 190400
for 7 and 8 HP horizontal engines ( early style) 
1 5/16'' (33.3mm) ID x 3 13/16'' (96.8mm) OD x 2 15/16'' (74.6mm) HT