steering tensioner Renault Clio 1999?

can anybody tell me the part names/No's for the following: Nut & Bolt that goes thro' tensioner.This has threaded so need these and the part that the bolt screws into so that the tensioner will then be tight?? Then i can go to Renault (OR Somebody?) to order these bits Any help with names/No's etc would be greatfull