Best NB steering size?

Hi, looking for some feedback from the members. My nb came with a dished aftermarket wheel. However…the boss seems to slim to be able to re fit the horn button, plus I think i want a flat wheel again.

Anyone got any views on best size to fit? Will mainly be a track car (maybe some road in future, but not a daily). Was also wondwring about a std round or flat bottomed one?

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