As Andrew says, P45t are the correct ones and there are many options:
Halogen 60/55w, clear or with a yellow glass cover, 6v or 12v.
Halogen 100/80, 100/90 or 130/100w.
Original tungsten 45/40w, clear or yellow, 6v or 12v.
(I keep all of the these in stock apart from the highest wattage, the...