look ,,weld a large washer inside your boot over the hole left after cutting off the rusty item,(halfords sell em),,then get a nylock nut+bolt through onto the cage rubbers,,for the one on the wishbone side,,,you could try cutting it + drilling out the remaining to replace with a threaded sleeve,,(for a new bolt),or carefully drill a small hole through the bolt,,and slip in a retaining clip,or a split pin,remember to be carefull as its petrol petrol petrol!!