Flywheel oil seal for lawn tractor lawn mower compatible TECUMSEH Models: BV BVS BVL HBL HSB 40 153 173 198 Inner diameter (mm): 20,6 Outer diameter (mm): 31,8 Part No.: 320085 - 30270121 Original part No.: 29610017 - 32600 - 26610001 NS - ah m