Depending on the year make and model
some nipples are 1/4 x 28 ASE
others are 6mm x 75 metric
And yep different brands fit different caps better.
For yours, trial and error is expensive.
So find one that will be the same for all.
Contact the mfg or nipple ask them if cci or remmy fit best
same with #10 or 11.
Personally I prefer #11 on mine.
All none size, little hotter spark.