@conan, you are mixed up in terminology. I’ll try to explain things a bit using the picture below.

Both items are the internal organs from a Convoy tube shaped flashlight (or torch, if you wish)

On the left you see the short brass pill and the long reflector from a Convoy S2.
This one has a faily long spring mounted on a nanjg AK-47A driver with 3*AMC7135 regulators.
I know this because the are no AMC7135 visible, and there is max of 4 AMC7135 per side.
So the AMC7135 are all mounted on the downside of the driver, inside the pill.
Under the pill you can (barely) see the “wing” of a butterfly shaped ring to center the led.
It’s normally not as visible as here, but this one has already a UV led, mounted on a thicker MCPCB.
Under that you can see the reflector (smooth, in this case).

On the right you see the long brass pill and the short reflector from a Convoy S2+.
It has a nanjg 105d driver with 8*AMC7135 regulators. I you look sharp, you can see some of them.
Insiders recognise this configuration because this model is known for its short (stiff) spring.
This one has still the standard XM-L2 led, mounted on the original thin aluminum PCB (led-board)
Under that you can see the reflector (orange peel, in this case).

The FX-12 you’ve read about, is another (newer) version of a 17mm driver used for this type of flashlight.
The pill’s are the bronze cyilindrical objects with a led-board on one side and a driver on the other side.