To get answers about your car, you will likely get better responses from this site:
https://www.benzworld.org/forums/r-c107-sl-slc-class/. When you get there, register and fill in your cp at top of page. Many 107 owners there including some with SLCs.
Manual describes seat removal. see attached pdf. Full manual here:
https://www.startekinfo.com/StarTek/outside/11883/?requestedDocId=11883
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Graham
85 300D
,72 350SL, 98 E320, Outback 2.5