I'm all about keeping the original look, whenever possible. That said I replaced my living room light/vent combo with a Fantastic Vent. I justified my actions knowing they are standard equipment on newer trailers. Since I didn't want to lose the light fixture, I wyed the power connection and installed a light fixture next to the fan. This light fixture matches the one I have in the hallway by the bathroom.
Just saying, in case you change your mind. BTW, the subject of replacing the old vents with a Fantastic has been beat to death here. You will find plenty of photos and descriptions of the job, which only takes an hour or two.
When life gives you lemons, don't make lemonade. Go get the oranges that you really want.