FLD120 vs Classic exhaust routing

My single dual exhaust has rusted through in a few spots and I want to do dual stacks on the side. I've been looking around and some sites will say classic, others will say FLD, and others will say FLD & Classic. This leads me to believe that the routing is the same on both models and I can order either one. Does anyone know for sure?

 

I tried and they're being stupid. My model has a single rear exhaust so they're saying I can't do stacks. I won't get any help from them. There's more than enough room under there and I've seen plenty of FLDs with stacks.

 

Thanks for the tip, I'll make sure to watch for that.