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For my 2003 Arnage T I have found the following parts either identical or superior to OEM :
Front lower ball joints = Lemforder # 1074102 (009) as used on Mercedes
Front upper ball joints= Moog #K9025 as used on Volkswagen
Tie Rod ends = Napa part# 269-2658 (not exact but much stronger)
The Fuel Injector seals are standard Bosch as used on 2003 Audi S8 4.2L V8
The Fuel Pressure Regulator is Bosch # BOS 1287010001 as used on 2003 Audi S8 4.2 L V8
The RH5000 hydraulic fluid is available at O'Reily Auto Parts .
All these parts should cost a fraction of what Bentley charges . In the case of the upper ball joints 1/10.
I replaced my power steering cooler with an after market hot rod unit (had to fabricate brackets, very easy ) . OEM unit is $1500 Hot Rod unit $100 and of better quality.
I will provide the Gas Spring # soon as I yank mine and match them up ( these fail every 5-7 years) . They appear to be the same as in the big Mercedes but I need to verify the pressures are the same. You know yours have failed if your ride becomes bouncy and seems hard.