OEM Oil Seal used on the following Kymco models:

MXU - 150 / 250 / 270 / 300 - all years

Mongoose - 250 / 270 / 300 - all years

Used inside the transmission, please reference part #91256 on this diagram, to verify this is the part you need.

Measures 24.8 x 52.2 x 7 mm