Coca cola cornelius chest machine help????

I bought a Cornelius chest Coke machine that dispenses cans. It has the wood grain look and a light up sign in the back. The only problem is there was no light bulb in the sign. How in the world can I find out what size it takes. It takes the long tube light bulbs. Thanks!

[johnieG]

Fluorescent lamps are selected by diameter & nominal length
the diagram below might help you to determine what size/length of lamp that would fit into the fixture, & check the ballast ( transformer) too, as they are rated for specific lamp/wattage sizes & often list them on the label of the ballast ( if your lucky... :'> )