Will use 1 ton shackels in any case which helps with the clearance of the track rod.
B.9. SUSPENSION.
B.9.1. Leaf-spring shackle plates may be altered but the distance between the spring bolt centre and the chassis bolt centre must be no more than 6" / 152.4mm. If greater than 5" / 127mm between pin centres, they shall incorporate a mid-point strengthening device forming an H-shape assembly.
B.9.2. Any make of suspension springs may be used but they shall be the same type as those fitted as standard for that model. (See B.20. “Use of non-Rover parts”
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B.9.3. Leaf spring types:-
B.9.3.1. In all cases, the ends of the top and the second leaf must wrap around the eye.
B.9.3.2. Springs that were originally built with more than 5 leaves may be rebuilt so as to have no less than 5 leaves. The leaves below the top two MUST be in proportionally reducing steps similar to the originals and must be of the original thickness.
B.9.3.3. Parabolic leaf springs may be used but must have at least two leaves on each spring. (This allows, but is not restricted to, the use of leaf springs built to the Santana parabolic designs.)