Memphis shield (that I made mirror brackets out of, the shield was junk after a crash on my VN800 Classic in 2/2008, but the bar clamps make killer mirror mounts). Emgo filters, even the dealership used to buy Emgo from the shop I was at and repackage them in oem boxes for the do it yourself owners. Hi Flo work fine as well.
The factory stuff is all aftermarket sourced and put in official packaging anyway. Suzuki parts are made by the same outfit that makes Fire and Steel stuff for Kawasaki.
Was in the industry for a long time... Keihin is Honda, Showa is Honda, Denso is Toyota, NGK is a Denso subsidiary... Mikuni is Yamaha, Stanley electrical is Denso, any HD part with a K in the part number is Honda/Kawasaki/Yamaha/Toyota sourced...
Parts is parts. Most of the aftermarket high dollar gee whiz trinkets (chrome, lighting, etc) are made in Taiwan by Emgo and put in fancy packages (look at license plate frames some time, I've peeled off dozens of Kuryakyn labels that were over Emgo labels)...