It’s that time of year again. Well, not really, but we can certainly start looking forward to it. As the days get longer, the air gets warmer, and the smells get a little sweeter, it’s hard not to dream about one thing: convertibles. The snow hasn’t completely melted here in Boston, but what’s on the ground now is a far cry from the over 8 feet we’ve gotten this winter, and that completely justifies our looking months into the future.