K11 passenger wing

Hello everyone I have just changed my passengers wing on a K11 1995 1.0.
The only problem I have is the old bolts for the bottom of the wing and the sill have rusted on.
I tried drilling them through but the drill made a bit of a hole in some of the bolt but would not go all the way through to put a new bolt and nut on.
Is it my drill bit I am using as it is a standard HSS drill bit.
Do I need a special drill bit to drill through the bolt.
Could someone let me know as this is the only thing wrong with the car now.
Thank you

Darren
 
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