How do the hex bolts on the front of a 2nd gen differential for a W126 hold it in place against the rear subframe?
I loosened them but I can't seem to take them off or tighten them back on. When I put my hand above the subframe where they are suppose to have some sort of a nut all I feel is a rubber disk that's spinning whenever I tun a the bolts. I am stuck!
I can't lower the diff like I first intended and I can't tighten it in place now that I changed my mind.
Any help will be appreciated.

There should be a 17mm nut on top of the washer stack. It's a bear to get a tool on and hold. A stubby 17mm wrench is my first choice.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

I couldn't feel a nut in there, just s rubber disk that spins when I turn the bolt.