It's going to be damn near impossible to replace Jezzer, Hamster and Captain Slow. First of all you need 3 funny people. They need to already know each other for years and most important, none of them can be too fucking cool for school. They have to look like dorks, act like dorks and aren't afraid to get their hands dirty and fuck up. There are three guys on YouTube who somewhat fit that bill. They do cheap car challenges too. But I think they are too young and coming from YouTube, they aren't very famous. But those guys know the formula.