WT is the correct master cyl for 1967 & 1968 with power disc brakes. I've seen several but I think it was determined that there was no date code in the casting. I would look for one with WT stamped. Mike can get you going in the right direction....Joe
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1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E
1970 'cuda Moulin Rouge, 440-6, 4 speed
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