1936  was different then 1935 body styles with the addition of a closed cab ute. The ute being distinguishable from the USA pick-up by its suicide doors and bed integral with the cab.

1936
The sedans and tourers got an integral boot/trunk (Frankpic04). The Integral boot lid was an option.
Holden still supplied 1936 bodies without a boot as a carry over from 1935 bodies.
The open cars got fixed windscreen posts - not bolt on as in previous open models.
The sport coupe was discontinued and replaced by the 3 window (Vauxhall CX based) coupe// I have never been able to confirm this furphy. The Vauxhall and Willys coupe bodies where indeed constructed side by side at Holden and no doubt a few mouldings or sections of pressings ended up being used between the makes but the bodies and doors etc were not interchangeable. At best it could only be said that the Willys body was styled from the Vauxhall or perhaps the other way around.

Sammy Cooper's ex John De Vries 77 3W coupe is NOT a 1933 - this bodysytyle was not built until 1936 and actually used a modified Vauxhall CX coupe body with 1936 Willys front sheetmetal.  About 60 of these were built.  J De V put 1933 front sheetmetal on it sometime in the early 80's.

Differences between 1936 Willys and Vauxhall bodies
-Vauxhall body has tailshaft tunnel in floorpan but Willys body doesn't;
-Vauxhall wheel tub pressings have squared off corners while Willys are rounded;
-Rear mudguards will not interchange because Willys guards have a tighter radius at the body and Vauxhall guards are longer to the rear;
-Vauxhall body has a solid roof whereas Willys uses an insert.

The 1936 Willys roadster is a 1936 Vauxhall CX body with Willys  front sheetmetal sat on a Willys 77 chassis.
Same applies to the 1936 Willys 3 window coupe - Vauxhall CX with nose job.