126 front swaybar R&R
Been there, done that. Found one end one my 82 500SEL (Euro) corroded too much for my comfort-- I cleaned, measured, calculated, and then got smarted about it and didn't like the thought of what would happen when/if it snapped. In 'salty' areas of country, the end rubber bushings should be removed every spring and the end of the sway bar cleaned and repainted.
Not a technically challenging job, just LOTS of time and things to remove. EVERYTHING in the space between the two firewalls must come out--EVERYTHING--including the fuse box.
No other way to get it in and out. Get a clean used one from a 'recycling' yard cheap