Ya the top one. I got vise grips and kept spinning it until loose. Then pulled as hard as I could while spinning it. Broke off once but I got it out.

It was siezed in there all rusty. I even sprayed copious amounts of pb blaster before attempting to pull them. I also didn't loosen the tensioner before attempting the top and that may have contributed.

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1987 300 SDL
2000 E320 Wagon