Thanks Jay762, most of them are pushpins but there's about 6 screw/washers as well. Sadly when the splitter ground out it snapped the bumper around two of the screws where a pushpin would have popped out. I've managed to put a temporary fix in to hold the splitter in place until I can fix the drive, get a new bumper and splitter and then get it repaired.
Also worked out that if I revers off the drive it doesn't ground! Doh!