For Skilhunt H02/H03 it’s the Astrolux S1/A6 tube 18350 not Convoy. (I corrected in the list)
H02 with S1 tube confirmed here: Short 18350 tube for Skilhunt H02 and H02R: are you interested?
H03 with S41 tube confirmed here: (post #12) Lightest 18350 flashlight? - #12 by ZozzV6
But you cannot buy the S41 tube by itself, only the S1/A6 tube, but should be the same since the 18650 tube fits all of them S41/S42/S1/A6