[British Cars]Unknown gear?

[web@Autox.Team.Net]

I'll try not to get carried away with shameless self promotion here, but
I've currently got a gearbox laygear on Ebay, item #4504531590 which
is part number AEC 3359.  Moss Motors claims this fits AH 100, 3000
early gearboxes.  I also have another very similar item, AEC 3475,
which I have yet to be able to identify given my sparse collection of
parts books.

Anyone know what it might be?

Thanks,
mjb.

ps: http://fatchancegarage.com/AEC_3475_laygear.jpg