ergomaniai don't see Havi B3 Pro-1 listed in their list or on their site. you could jump over to complyfoam.com & ask which size would fit. as far as i know, the 100 will fit most with 1mm barrel/nozel, 200 for 2mm, 300 for 3mm, etc... (someone else chime in here if this is not correct) so if you can't get an answer, that would be a way to guess which to pick.
LOVE comply! too bad i just picked up a pack.