152 and a minimum of 1.45"-1.52" in length. I did a 2-2-4 pattern with the pitch with 4 I put 2 on the outside. You want to make sure to keep studs away from the very center of the track as the shock will hit them. Track has 57 pitches and IMHO 2 per pitch is not enough. You want to take advantage of the bottom pull these things produce!
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