I'm sorry for overlooking that! I see now you had posted that in your first post. I think I was too focused on the images.
I won't lie, that's a bit of an odd arm size for this kind of operator, but please give me a little more time to look into this and I'll get right back to you.
Hello! This is good timing. I just asked our purchasing manager for an update and I have been told that our 39-497 and 39-498 have been added to our inventory and are now available for purchase on our site. These have much smaller arms at 8-3/8". Look them over and see what you think.