Hello everyone - am looking to buy a used T6 LWB 17 reg and would LOVE some advice! we have two children 7 and 5. The van we’re looking at has two seat belts across the rear bench but not sure if they’re long enough? The dealer said they were 103cm fully extended. Any advice on what a standard size is? Our oldest is 130cm, and both are heavy enough to have a booster rather than a car seat. Thanks so much!