The Taifun GT is 23 mm, GS is 17mm. The Kayfun is 22 mm. Neither would be considered clearomizers, they are rba's, re-buildable atomizer
tank systems. 23 mm or 22 mm would fit fine on your mod. It's more about what gives the best vape then what sits flush with the diameter. I'm sure whatever you choose will look quiet excellent on top the Caravela.