Let's start under the dashboard. During 1968 Ford used two different clutch/brake pedal supports in the Mustang. All 1968 Shelbys used the C7ZZ-6501508-B pedal support. This support is used for cars with power brakes.
The 1968 clutch pedal is part number C8ZZ-7519-B. It uses a square clip on the end (shown above). A 1967 clutch pedal uses a cotter pin. Even though the pedals are different, they are interchangeable.
The clutch pedal pad still carries the original C5ZZ-7A624-B part number.
This bar connects the clutch pedal to the equalizer bar under the hood. In 1968, there are two different connecting bars. The upper bar was used on the big block cars. It is part number C7ZZ-7521-A. The lower bar is used on the small block, GT350s. It is part number C7ZZ-7521-E. Both bars are 12 1/2 inches long. The small block bar was discontinued by Ford in the 1970s. They replaced it with the big block connecting bar. I have tried using the big block bar with a small block equalizer and the fit is not very desirable.
Both of these bars use the same rubber boot at the firewall. It is Ford part number C60Z-7A533-C.
The GT350 used the C7ZZ-7528-G equalizer bar (also called a "z"-bar). This part is shown in NOS form. The original production part has a yellow color code.
Many service parts are zinc plated. Production parts tended to be bare steel without the plating.
There are two springs on each equalizer bar. The springs for a small block car are C3DZ-7523-A (upper) and C6ZZ-7591-A (lower). Both springs were black. The lower spring is shown.
These are the big block springs. C7ZZ-7523-A (upper) and C7ZZ-7591-A (lower). Both of these springs should be blue in color.
Upper springs are attached to the firewall with this bracket. It is part number C7ZZ-7542-A. The bracket is painted semi-gloss black.
The pivot mounts to the engine on a GT350. It is part number C20Z-7A572-B. The bracket on the frame is a C5ZZ-7507-A.
The adjustment rod for a GT350 looks like this. The block can be adjusted by moving the two lock nuts. This is part number C80Z-7521-B. You may have noticed this part has the base number as the upper connecting rod. I am sure this is a source of confusion. The reproduction rod is slightly longer than the originals I have seen.
Big block cars use a different shaped rod with a bullet shaped adapter to fit the clutch fork. Both nuts are behind the bullet and the lower spring tension holds the bullet adapter in place against the fork. The part number for this part is C8ZZ-7521-A.
These are the big block clutch forks. The 428 Police Interceptor uses the spring style C80Z-7515-B fork. The Cobra Jet cars used a later version with the Part number C80Z-7515-D. This fork has a blue identification code and clip type retainer.
This rubber boot fits around the fork at the bell housing. This NOS boot is for a big block car, part number C60Z-7513-A. The boot changes according to the fork being used.