Thanks, I updated these, indeed coupés have a separate chassis code according to Wikipedia.
It is a good way to find them
https://www.imcdb.org/vehicles_make-Subaru_model-GM.html
There is a mix of sedan & coupé in their category:
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Subaru&model=- GM
As discussed before I'd tend to say it is a 2-door sedan but maybe coupé is more accurate?

If we search GC chassis code with coupé category we find these:
https://www.imcdb.org/vehicles.php?resultsStyle=asImages&yearFrom=&yearTo=&makeMatch=- 2&make=subaru&modelMatch=2&model=gc&modelInclChassis=on&mk=&class2=2&origin=&madein=- &madefor=&role=
I suppose that some should be changed to GM ?