This bearing buddy bra is designed to fit the 1.781 or 1.810 bearing buddys. It also happens to fit over top of the 1.980 Accu-Lube / Posi-Lube dust caps. This is Genuine Bearing Buddy® part number 17B. This cover slips over the end of your bearing buddy to help keep it clean and prevent grease from slinging all over your wheel.