Looks like a Midway type fixture. I just redid my MB WB and it came stock with like a 14" fixture. Same as other Nintendos.
You can pay up for that and forever have to special order bulbs and starters, or buy a $10 18" fixture at WalMart that looks pretty much the same. Or I mean you could just toss an LED screw in bulb in there, but the lighting might be kind of uneven.