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I would take that to a lighting store or perhaps Loew's might have someone familiar/w it. Don't know if their not available any more because they do have some four pin bulbs on-line at some of the sites which specifically sell bulbs. If they are the same size is another matter. But my main concern is the ballast and matching it to which bulb is correct for it.
If you are limited on buying then you might want to set up one tank/w a new light fixture so they won't cost much for the bulbs.
If you are limited on buying then you might want to set up one tank/w a new light fixture so they won't cost much for the bulbs.