Vity's Diamond Design Master Cylinder CoversDMND M C CVR HYDR CLUTCH BLCK FLH T17 UP CNC machined in Vity's Diamond design. HS Number: 8714109090 Note: The new DOT 4 (as used in the late models Harley Davidson) can be mixed with the old DOT 4 without any problem, even with the older DOT 3. The new DOT 4 CAN NOT BE MIXED WITH DOT 5. DOT 5 is a Silicon based fluid that has its own formula. This also means that DOT 4 can not be used in a system that has been on DOT 5 (and vice versa) unless the