I don't have a picture....
But they used a modified fill-tube design. Instead of ending with a circular outlet, they had a plastic "wing" looking thing that ran up the front of the bag and terminated with a bag mounting boss that fit the Type-A bag.
Incidentally, the outer bags on the Type-A machines were larger than the Type-C versions to accommodate the larger bag and the fill tube.
You can actually retrofit any convertible using the clip on bag setup to the Type-A bag design simply by replacing the fill tube assembly. I know the earlier Convertibles used a metal clamp setup, but I'm not sure if they can take the later plastic style clamp. If they can, you can convert all Convertible models. Oy.....getting tongue tied!
Hopefully someone else will share a picture if they've got a Type-A machine.