My apologies if this was previously discussed, but wish to inquire which armrest extension you guys use in your Forester. I checked Subaru parts site but there isn't an official armrest from the company.
Not in the 2019+ MY.
I understand the frustration the OP might have here. I quite miss the extending armrest, as I have them in my Impreza and XV. Every time I get into the Forester I try to push the armrest forward, like in those cars.