Suggest you dispose of the old fixings and buy a complete new set, such as https://shop.kingswayplumbing.co.uk/fischer-wall-hung-toilet-fittings-3472-p.asp
If the wall behind the pan has been damaged, it will need to be repaired before reinstalling, the wall must be 100% flat and vertical where it meets the back of the pan.
If the wall behind the pan has been damaged, it will need to be repaired before reinstalling, the wall must be 100% flat and vertical where it meets the back of the pan.