Hoping you guys can answer this question. Maybe @RipTideSports could chime in too.
We having cup washers for barrel bushings but I have never seen cups\ washers for larger bushings like the Riptide fat cone or chubby.
Is there a reason why?
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I was under the impression that with wider bushings, the squish is proportionally less than a regular sized bushing of the same duro, so using a flat washer lets it squish more so you can get more fat-bushing benefit.
I also don’t know what I’m talking about.
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The fat cone should fit “normal” bushing cups. The smaller end goes into the cup (boardside). There are a few trucks that can take a chubby. Which trucks do you have?
Edit: throwing an edit in here to say I completely misunderstood what you were asking, but leaving original post to show I can be obtuse sometimes 
I have run several fat cones on DKP and TKP set-up. I have always had the larger diameter side of the bushing boardside. Always paired with a large flat washer from Riptide. There is no way the big side of the bushing will fit in the hanger.
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Metroboards dkp can take a chubby bushing. I designed bushing cups for surfrodz tkp to take a chubby which I use in both my dkp and tkp builds. There are several rkps that will take a chubby as well (bn, caliber)
Yo bushing cup sounds like you are referring to a pivot cup bushing. Which is even farther from the two bushing seating parts that could be conflated.
How about cupped bushing washer?
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This is incorrect, the small end of the FatCone goes into the bushing seat and the stepped end of the Chubby goes into the bushing seat also. On trucks without a bushing seat, you can run a FatCone and Chubby “flipped” but not many trucks will accept that orientation.
The reason why very few people would need them because the shapes support so much more weight and a cup washer would be overkill making the trucks unturnable for 99% of riders out there. Since the application is so limited, the expense to make them is extremely high. Stamping is out so machined is the only option.
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Sorry, my verbage when referring to truck parts, pieces, orientation and ends is lacking. I suppose I meant “seat” instead of cup
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That makes sense. I am a bit on the crazy side maybe I will give it a try!
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