I have a Jett 130 with Ti rail. Ohh just checked. It has bit of pink trim on it. It does have a cut out. Would he try it out and see if the cutout would work for him?

If the cutout works for him then you can go out and find him a seat with a cutout and feel bit more confident that the new seat will work for him. I could send it to you for free and he could try it out. Then you can send it back or we can talk about it. I highly doubt any self respecting boy would use any gear with pink.

smilingcat