Without height adjustment working I cannot get to bolts. Tried spray lube as far as I can reach, but no luck. Any advice?

I'm not following you on "height adjustment". I have always slid seat all the way forward, remove rear fasteners, move it all way back, remove front fasteners.

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Jim

Moving seat fowsrd will not expose rear bolt. Only when seat is back and side pull is lifted will. Seat move forward and up to expose rear bolt, but mine is stuck

I'd inspect the mechanism from handle ( to move seat front/back) to the mechanism where it locks it into place on track. You may need to manually release the lock mechanism if you can get screw driver to it.

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Jim

A seat moves well front and back

The seat height adjustment mechanism can get stuck from lack of use, due to corrosion and dried grease.

Try directing the air flow from a hair drier at the outside chair rail to soften the grease before attempting to lift the seat upwards.

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022