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you want some black 1/4-20 acorn nuts and black washers- usually find them on ebay because hardware stores don't carry them. I used those and also a pair of small tractor control *****, they are black 3/4" round ***** with a threaded 1/4-20 hole.
You can also use:
automotive air cleaner nuts they are all 1/4-20 and they make dice, skulls etc.
electric guitar control *****- they are 1/4" shaft hole with an alan set screw on the side. lots of cool designs like small black skulls, black small knurled *****, etc.
here is an example of the acorn nut- you want black oxide finish and not powdercoat. kind of expensive for one nut but search online for better deals.
and if you want something ultra-flush, get some 1/4-20 black furniture cap nuts. home depot has them for about $3 bag of 6. they are typically 1/2" long on the threaded shaft but you can easily grind them down a bit if needed.
example on ebay: www.ebay.com/itm/161241903777
^^ I had a set of those motherwell *****, they chip and look ratty after a while. might as well just paint your current ones black with a good appliance epoxy spray paint. plus they are just as tall and hit you in the *** just the same. the only time i use my stock ***** is for the wife and passenger pillion seat.