I have 2 rear inner suspension arm bushes for sale, original Peugeot parts. Part number 5131.80. Purchased for a 1.9TD but I understand these fit most if not all 406's (check first, or send me your VIN and I'll check Servicebox).
£16 for the pair delivered.
'97 Peugeot 406 1.9 TD, 316k, down for full rebuild with custom rods, TD04 and a stack of welding.
'95 Peugeot 405 1.6 GLX with XU10J4RS conversion @ 195bhp.
'05 RenaultSport Clio 182 Cup, 111k.