need help: reclining rear seat upgrade

[needmoretime]

My 300SDL has the standard fixed-place rear seat. I bought an entire interior to replace/upgrade my aweful condition original interior. This interior is from a 90 560SEL, with the power reclining rear seat.

I have never seen what the 560 SEL looks like without the rear seat in-place. I think that there is something on the body at the top of the seat back which allows the seat back frame to pivot.
I do not know how far away from the sheet metal the pivot point needs to be, or at what vertical distance from the rear deck.
I also suspect that I need to grind off the tabs which lock the fixed seat back to the body - but would like to know for sure before I do.

Does anyone have a 560SEL without the rear seat installed who could post /email a pic of the seat back area?

Thanks!