OOOF!

Not good.

These are cap head screws, right?

I suspect your problem will be getting access to the fasteners, since the trans tunnel is close by.

You can drop the trans crossmember and tilt the tranny down at the rear and get some clearance.

Then it's either pound a larger hex key into the head or try to drill out the heads.

Jim

__________________
14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles