Nathan Young wrote:
Anyway, is there any way to adjust the seat height on a 1976 A36? The
present owner did not think so.

It sits atop the spar so it is cannot be lowered.

Any other workarounds?

Remove and replace the existing seat pan padding with a thinner, high
density Confor foam to reduce the height.

One other question: Can the 3rd/4th seat in an A36 be turned around
to face aft (ie club seating). I am interested if this is feasible
and legal.

Depends on the year, perhaps. Some models of the A36 do have club seating.