['ol Pinion head]

As most of us know '67 & 68 GM factory disc brake cars had 4 piston calipers & caliper brackets. There are at least 2! if not 3, different pairs of original 4 piston Delco Morraine castings that will bolt to the '67-68 A/F body factory caliper brackets.

'67 & 68 Firebirds with factory 4 piston disc brake sets used a different casting caliper than A-body Can't soeak first hand for '67 Birds, but at least on '68 Birds, when the Rally II wheel option was clicked, the Firebird was assembled with the JC coded rally II's, whether drum or factory disc car.

Standard steel 14x6 wheels for '67 & 68 Pontiac A-bodies mirrored the above rally II usage. One 14x6 code on drum brake cars & HK's on 4 piston disc equip cars. For some reason, every inquiry I've had for HK coded 14x6's have all been for Firebird usage. Have owned over 400 '66-73 Pontiac A, F, GP partscars, projects, keepers, have boneyarded extensively, & have owned less than 3 sets of 14x6 HK coded disc steel wheels.

On factory 14x6 RallyI's, I was shown a set of nos Rally I's near 40 years ago by Phil Bauman (Classic GTO Newsletter) that he purported to be disc brake only Rally I wheels. Believe it was Dennis Kirban that said they were "mistamps". Have never had the occasion to fit an original Rally I wheel on a factory '67 or '68 4 piston disc car, am sure there are several here on the Forum that have that experience & if detail oriented enough, can better respond.