What kind of hitbox should I use for different sized characters? (Punch Combat)

[Wyzloc]

Since R15 scales differently based on height, what kind of hitbox should I use? Players who are way taller than other players might completely miss their attack.

[ChainsawRBLX (Chain)]

You might wanna try this raycast hitbox.

[Wyzloc]

Only problem with that method is that if the size increases the attachments length between eachother also increase making the hitbox more spread out.
e.g