I use the 4/5 hole tapered TD330179 drilled to suit (these were popular before 2/3 holes became used by the team drivers). See the Adam Skelding base set ups...
You can always drill the kit blank pistons to whatever you like or buy the v4 set TD330590 when they become available.
I've tried the less bigger holes pistons 3 x 1.6 etc but have gone back to the tapered 4/5 hole because I prefer it. Down to personal preference & track types I guess....
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