Pretty much anything not covered by the topics above. Short lived production bikes or vehicles, Electrical, Tires, Paint, Brakes, etc. Use this for tech questions, and "Shoot the Bull" for general conversation, no tech.
When I built the tall bars for my 101 Scout Chopper I took a set of early 70's Sportster (they are the cheapest) bars, and cut off the end and welded it to the bars I was using. That got me Stock HD parts, Internal Throttle, and it worked real well.
The -74 throttle assemblies work well on bobbers/customs. They were used up until about 1981. Most of the aftermarket companies offer a replacement part, but I've seen some that don't open the throttle all the way. VPH-D