PoppaSmurf

Does anyone know the drain fill plug bolt size?

So I haven't had any luck finding a longer bolt. The plan was putting a longer bolt or using a recessed hex bolt. (Both suggested by other people).

I noticed a leak of transmission fluid in a 2014 Subaru Legacy. I check under and it looks like the the transmission fluid fill plug is broken. The top half of the threads are gone. Is it possible to put a longer transmission fill plug bolt in to reach those inner threads? The two broken pieces were attached loosely. I’ve attached images https://imgur.com/gallery/b31m6mK