Hello! Does he still have the seat belts?If you cannot get the TSB thing from Yamaha, (LotsOfLuck) You can get them new from RMATV for $127 each plus about $50 for handles if they actually ship within 7 to 10 days. My son has his original 2008 set that I am sure he will sell for a fair price. PM me with an offer and I will check with him. He also has the original seat belts if anyone is interested.
I could use them for sure. I have a 8 year old that loves to ride but when i bought mine the seatbelts had been removed. Shoot me a price and maybe I could take them off your hands.I am fairly sure he does or they are in my basement. I replaced the OEM with 4 point harnesses.