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They were probably torx head screws, those tend to be used on a lot of vehicles now.
The first thing you need to do is clean them up and see what you’re dealing with. Sometimes you can clean out the crusty rust and get a tool to engage them again. Just make sure you’re using the right size.
If they are completely fubar’d already, read on.
You need to remove the heads by drilling. Select a bit size that will allow you to use what’s left of the recess in the head to center the drill. You want to end up with a start to the hole that centers the point in the center of the fastener. Next, take a bit that you estimate is no bigger than the root diameter of the screw and drill into the shaft of the fastener, slightly past the bottom of the head. Try to knock the head off. If it doesn’t come off, go one step up on the drill bit size and drill gently to the depth of the bottom of the head. What you’re trying to do is drill the head off without disturbing what’s left. Once you have the head off of both screws, remove the part and then grab what remains of the screw with a pair of vise grips and unscrew it.
It takes longer to write about it than to actually do it.
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