go to halfords and buy a universal exhaust mount for about £2. this is a rectangular shape and will fit into the original metal housing if you cut the top two spokes of the 'X' out, and the centre circle. this is a stronger rubber and you can hook the exhaust through this mount and leave it, as i have done. or you can pack the lower holes with offcuts of rubber from the original mount if you have a particularly heavy exhaust and need it reinforcing.
did this to mine last year and it allows for a bit of movement, so no chance of anything breaking. but keeps the exhaust reasonably level and hasnt moved if at all.