I have an extra set of the W123 Rear SLS Shocks, Pump & Valve with Lever Arm.
As you probably already know, if you are fortunate to have a Gas M110 Engine installing the Pump is easy. Remove RH Cover Plate, remove RH Camshaft Sprocket Bolt & install the Pump Drive with same Bolt & then Pump.
PM if you need parts

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80 280TE, 5 speed
83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts