Did you choose your shock length or order G body rear coilover?
The Moser style refers to the shock mounting hole is incorporated into the lower control arm mount. (Just like quick performance and currie) Which needs a different bracket to mount coil overs and it Moves the lower shock mount inboard for more tire/wheel clearance.
Factory A body axles have two tabs for lower control arm mount and shock. The mounts for coil overs use the lower control arm bolt and the shock mount together. And usually drilling a third hole above the lower control arm bolt and the axle tube for more strength.

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