You could just install both in the rear doors, and hope for the best. Either it will interfere, or it won't. If it does, just don't use it while moving(so it doesn't rattle). but either way, they will match, left and right.
I like having them. I actually leave them open most of the time. Rain doesn't come in, and on the road, having a front window open is nice. Somehow, having the back ones open reduces turbulence up front.
Go Metric, Every Inch of the Way