Replacement fog lamps for '85 Mondial cab

My fog lamps don't light up. Never have, but I thought maybe I'd get them fixed this winter. As is usually the case I'm sure I'll be having some wiring re-done, but also need to replace the factory units. Need something that fits in the current hole and don't want to tax the system with anything higher wattage than was originally installed (though I'm not sure what that spec is) although something more efficient/brighter would certainly be nice.