Actually, I understand what you're talking about because I had the same issue. The shoulder belt goes through the back of the seat, but that plastic retaining piece won't let you push it through.
This is probably way wrong and there's a much easier solution out there, but I couldn't find it either. I unscrewed that small metal bracket that is on the back of the seat where the shoulder belt fits through. Don't forget to thread the belt through that first!! I made that mistake.
If I remember correctly, I was able to slide the metal clip out of the plastic retaining piece. I pushed the metal part of the buckle through first and then used a flat tip screwdriver kind of like a shoe horn to squeeze in the sides of the plastic part until I was able to force it through the hole.
The issue was that the plastic piece would not come off of the buckle, only slide down the belt. That's why I pushed the metal through first, and then the plastic piece on its own. Do it slow and carefully, and it will go through the seatback. Some type of lubricant might help a bit.
Hope this helps.
BlueX22010-05-17 14:50:43
