Here is a u tube video to explain how to find the length.
Link:
https://www.youtube.com/watch?time_c...ature=emb_logo
Here is a link for custom shock brackets.
Link:
https://www.speedwaymotors.com/shop/...6-31222?page=2
So I would determine what style shock you are wanting to go with.
(looks ,Performance or comfortable ride.)
Start with trying the find a shock that (Will fit) your existing lower mount.
Then find a top mount that will work with your mounting options on the frame.
Then try to find the correct travel length.
Main 3 things is diameter of mounting bolts, width of shock mounting bushing and length of travel.
Hope this helps.
.
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The early bird gets the worm,
But the second mouse gets the cheese
84 Chevy K-20
63 Impala (my high school car)
http://67-72chevytrucks.com/vboard/s...Crew Cab Build