I took the rear ones out, as the kids have become too tall for them to fit. Need something though, as one of them still wants to come out with me.
Look on the securon web site they have the spec for all their belts , pick a longer one , I can fit 2 of me in mine
Roller mech, behind the seat, on an angle for the release mech, to wheel arch. Clasp strap, to fire wall, up through seat.