Arctic (who else?) recommends punching small dimples north, south, east and . . . west on the rivet you can see as it may grip sufficiently for you to undo those pesky bolts. I had the same problem recently but failed to get them out without distorting the hole. I've had to use rubber rivnuts (see eBay) to provide a safe replacement. Good luck.
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Rover 75 Tourer Conny 2002 remapped 160 auto, R75 V6 2.5L auto Connoisseur 2003
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