While the retrofit 3-point belts in the back seat of the 60 are an improvment, they are pretty much useless for belt positioning booster seats for my kids. The belt positioning booster is the hi-back type booster seat that has some kind of clip in the shoulder area of the seatback that routes the shouldber belt correctly for a shorter person. The seatback is too far back compared the to the mounting location for the shoulder belt on the c-pillar. The seatbelt actually has to travel backwards to get to the belt positioning clips before it goes forward again. As I tighten up the manually adjusted shoulder belt, it begins to pull the top of the seat forward while attempting to make the shoulder belt straight. On the bright side, both the lap and shoulder belt in the back seat of a 60 tighten up and lock (ratchet on the lap, manual adjustment on the shoulder) so the kids are very securely stuck in their seats. There's no slack for them to move around and then can't easily reach and pester each other.
I have not tried them yet with the backless style boosters but even when I sat in the back seat and tested the belts the C-pillar/seatback relationship still is an issue. The upper mounting point for the shoulder belt on the c-pillar simply is too far forward so there is a gap between the belt and my chest until it gets to about my waist. Although, I'd much rather be restrained with this solution than no shoulder belt at all.
I do have some traditional child safety seats that have their own 5-point harness built-in but haven't tried them yet. I expect that they will work just fine because I used them previously without the shoulder belt.
All of this is simply one more reason why an 80-series may be a better choice for people with younger children who still have to worry about child seats and booster seats.
I have not tried them yet with the backless style boosters but even when I sat in the back seat and tested the belts the C-pillar/seatback relationship still is an issue. The upper mounting point for the shoulder belt on the c-pillar simply is too far forward so there is a gap between the belt and my chest until it gets to about my waist. Although, I'd much rather be restrained with this solution than no shoulder belt at all.
I do have some traditional child safety seats that have their own 5-point harness built-in but haven't tried them yet. I expect that they will work just fine because I used them previously without the shoulder belt.
All of this is simply one more reason why an 80-series may be a better choice for people with younger children who still have to worry about child seats and booster seats.