Proportioning Valve Kit: 74-77 CorvetteThis pro valve kit for the Disc Disc 74 77 Corvette comes with brackets and hardware if you need it.. but is the best value. ALSO BUY A PVTOOL if you don't have one.. listed under "PVTOOL" Read below also.. and order the #PVTOOL if needed.. and if you don't have one . you will need this small part.. or your mechanic willl or it will be stuffed up most likely on bleeding it.. its NOT the same as a Holden.. .