I have just had an exhaust done on my 2003 k12 1.0 the bloke spotted that the bolts from the cat to downpipe one had snapped and one is stuck fast ready to snap if messed with ,so i am going to get a secondhand cat but it does not come with bolts or spring can anybody tell me what size and thread they are or a link to buy them please i have tried search but cant find an answer