I'll enter the fray.
My Sedan uses the standard Commodore booster, firewall mounted, the booster rod comes through the original brake master cylinder hole and connects to the brake pedal in its original position without any modification, no need to move brake light switch, used standard pedal no need to increase the size of the pad.
Commodore booster and master are great as the brake system is basically all commodore (if your doing that sort of conversion) so no need for proportioning valves and it misses the hinge by a fair bit withoput having to move it over to the clutch position.
My 10cents worth
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Neil H