On my 2011 FLHR I installed genuine vivid black lowers. Lasted and looked great for 3 seasons.
I installed Advan vivid black ones on my present Rushmore. One season and still as new.
I'd buy overseas again anytime!

 

Added the Matuza lowers from ebay for about $60 (plus $20 for hardware) on my '05 FLHT. Wanted the OEM ones, but the MoCo stopped selling the color matched Chopper Blue parts a year before I was ready to convert the standard to an ultra. Picked up a NOS '98 TourPak (fiberglass, not ABS) for $250 and a good friend matched the paint perfectly. (Sterling Autobody in Wintersville, OH if you ever need REALLY good paint work).
Those cheap lowers held up fine for the 92k miles I put on her before trading it in for my '17 FLHTCU. One of the vent doors did break once, but was easy to fix with some epoxy. Also, that is a common issue with the OEM doors as well.

 

I've been using the HD soft lowers for winters, but have been given serious thought to hard lowers. Some concern about the fit with my Heavy Breather Elite AC.

Can someone with a set installed, give me a measurement from the top rear edge of the lower (the part that may interfere with the filter) to the center of the throttle body on a Rushmore? I'll extrapolate the rest.

I appreciate it!