I suggest if there is not petrol leaking around the area and you feel it is safe , try heating the bolts to red hot with an Oxy Acetylene flame .
Allow to cool ,soak with a penetrating oil (WD40 is don't a very good product for that use) and carefully try to unwind the bolt .
In the past I have been successful using this method on other rusted bolts .
I don't want to be a pessimist but I don't like your chances of drilling out a loose captive nut with a broken bolt rusted into it ,unless you retap later with a larger hole/bolt
Geoff D
|