You’re only options with these centiles is a 36kg rear facing seat or a high back booster with seatbelt, you’ve maxed out every harnessed option but weight. I’d recommend the britax kidfix pro with the crotch guard as your son is still pretty small by height x
Can yous recommend a HBB? He will be 4 in the summer
At 3.5, he would be in danger in a HBB. A rear facing seat is the only safe option for him unfortunately x
You’ll need another RF sets at this stage as all FF options with a harness are already outgrown and they’re very young and won’t be cognitively ready for a HBB. Look at Axkid Movekid, Axkid Minikid 4 or Besafe Stretch, they’re all up to 36kg or 125cm
No, there isn’t a harnessed one anymore unfortunately for his height and weight and SPT is only for rear facing seats. There is HBBs. How old is he?