Early Sprite/Midget fans (for the Vertical Flow type Radiators) are exactly the same, part number AEA301, 2 Blade Fan, doubled up to make a 4 Blade Fan.
Also used on A30, A40, Morris Minor, etc, etc, ad nauseum...
Later 6 Blade Fan is 12G1597, for the Crossflow type Radiator, not sure if this will fit, best use the Early one's..
You'll probably have to use the correct width Spacer 12A312, or the Wide Spacer 12G2452, or a combination of the two, to space the Blades correctly, away from the Cylinder Head and Water Pump.....
I have all of the above, kicking around in my Workshop somewhere, if you get stuck...
Personally, I would'nt recommend a "Sucky Fan", just fills the Rad Gills up with crud, and there's always the risk of a small child, or stray animals being sucked in.............