I had the same issue on my TD. Air Die Grinder to open up the hole a bit at the top of the spring perch. The spring is no where near the center so you can remove some material with no ill effect. The steel was three layers thick here so you won't be doing this with hand tools.
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tgingrich
'83 300TD 282k
'83 300D 239k
'82 300SD 204k
DFW
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