Hello camping gaz bottle type 907 fits inside the cooker unit think you will be able to get a bottle as they are re-fillable mine s really old still in use.
Just to say that on our '69 Torvette model, the 4.5kg calor bottle is too wide to fit through the door of the cooker unit. A Camping Gaz bottle 'just' squeezes in, and a full bottle lasts all summer.