Got time today to take a few more pictures. The slide travel when the cab is raise is 6 inches.
As I remember, the tubing is 1/4 schedule 40 stainless. Then just a 1/4 rod that slides down the tubing when the cab is lowered.
Your V-6 may be different on the slide travel.
Hope these pictures help.

Don
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1967 GMC 9500 Fire Ladder Truck
"The Flag Pole"
In the Stovebolt Gallery
1946 2-Ton grain truck
1946 3/4-ton pickup,
1953 1-ton pickup
1957 1-ton flatbed dually,
1954 Pontiac Straight Eight
Of all the things I've lost in my life, I miss my mind the most!