Sorry to resurrect this thread, I realise there's quite a few 'RS4 ARB' threads out there. I've got a comprehensive parts list compiled and verified from different threads and Audi themselves:
1 x RS4 Rear Anti-Roll Bar (22mm) (Part #8E0511409AL)
2 x RS4 Rear ARB Bushings (Part #8E0511327D)
2 x Bushing Brackets (Part #8E0511439)
4 x Bolts for Brackets (Part #N10127707)
2 x Bolts for ARB links (Part #N10528103)
2 x Drop Links (Part #8E0505465AF)
But until today when I saw this thread, I hadn't seen the drop links mentioned anywhere. Are these necessary when replacing the ARB? Or is it just a case of it being a good idea as they're part of the same linkage?