looking at the cross section of the seals, i get it now. That's why I was asking if the rear glass is installed like the windshield...which doesn't use that system and is just sealed bonded in place, while the trim upfront is held by clips attached to the bodywork, and a rubber gasket/lip just attaches to the trim.
Only question now is: Is the trim installed LAST as a means of locking everything in place, it would be the most logical approach, as one can install the glass/rubber seal while the rubber part still has enough room to be adjusted via the cord.

Follow up question... what type of cord did you use? thanks

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project